Water Hardness in Illinois
Average: 254 PPMVery Hard1231 cities1,782 water systems
State report
Is Illinois Water Hard or Soft?
Illinois water is very hard on average at 254 PPM (14.8 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.
State average
254 PPM
Very Hard
Local coverage
1,231 cities
1,782 water systems
Source profile
907 ZIPs
direct or USGS-backed
Illinois has mixed source coverage across treated-water records, USGS monitoring, and estimated fallback values.
State data profile
How to read the Illinois results
State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.
Direct or USGS-backed ZIPs
907 of 1,335
68% use treated-water records or USGS monitoring.
Estimated ZIP values
428 ZIPs
32% use nearby, county, or state-level fallback values.
Dataset update
March 9, 2026
Source coverage and rollups are rebuilt from the public dataset.
Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.
State Average
254 PPM
Very Hard
Coverage
1,231 cities
1,782 water systems in the state rollup.
Data Source Coverage
ZIP-level source mix for Illinois; higher direct and USGS coverage means less reliance on regional estimates.
1,335 ZIPs covered
Verified treated water
Utility, CCR, or state treated-water records
37%
488 ZIPs
High-confidence USGS
Environmental monitoring matched to local systems
31%
419 ZIPs
Estimated
Nearby, county, or state-level fallback values
32%
428 ZIPs
In Illinois, 37% of ZIPs use verified treated-water records, 31% use high-confidence USGS monitoring, and 32% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Illinois
Hard or very hard water is widespread in Illinois, covering 67% of classified ZIPs.
Illinois uses a mixed data profile across treated-water records, USGS monitoring, and estimated fallback values.
Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.
ZIP Hardness Distribution
Soft0% (0)
Slightly Hard2% (23)
Moderately Hard31% (419)
Hard20% (266)
Very Hard47% (627)
Treatment Takeaway
For many homes in Illinois, hardness is high enough that scale buildup, fixture spotting, and appliance wear are realistic concerns. A local test is the best starting point before sizing a softener.
How to Use This Data
Use the source coverage above to decide how much local confirmation you need for a specific city or ZIP code.
Source-Backed Water Systems in Illinois
Large systems with treated-water reports or USGS monitoring behind the state rollup.
| Water system | Hardness | Source label | Population |
|---|---|---|---|
| Chicago IL0316000 - Cook County | 148 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 2,746,388 |
| Aurora IL0894070 - Kane County | 148 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 183,000 |
| Joliet IL1970450 - Will County | 148 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 160,000 |
| Naperville IL0434670 - Dupage County | 148 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 156,406 |
| Il American-Champaign IL0195300 - Champaign County | 300 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 150,000 |
| Rockford IL2010300 - Winnebago County | 300 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 147,051 |
| Il American-Peoria IL1435030 - Peoria County | 170 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 137,575 |
| Springfield IL1671200 - Sangamon County | 120 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 117,444 |
Useful Illinois City Pages
Shortcuts to city pages backed by more ZIP-code or water-system data.
Cities With More Local Data
Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.
Top 10 Hardest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | New Douglas | Very Hard (439 PPM) |
| 2 | Saint Jacob | Very Hard (436 PPM) |
| 3 | Mitchell | Very Hard (436 PPM) |
| 4 | Edwardsville | Very Hard (435 PPM) |
| 5 | Hamel | Very Hard (435 PPM) |
| 6 | Worden | Very Hard (435 PPM) |
| 7 | Marine | Very Hard (435 PPM) |
| 8 | East Alton | Very Hard (434 PPM) |
| 9 | Alhambra | Very Hard (434 PPM) |
| 10 | Collinsville | Very Hard (433 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Pittsburg | Slightly Hard (70 PPM) |
| 2 | Decatur | Moderately Hard (120 PPM) |
| 3 | Springfield | Moderately Hard (120 PPM) |
| 4 | Andrew | Moderately Hard (121 PPM) |
| 5 | Grandview | Moderately Hard (121 PPM) |
| 6 | Auburn | Moderately Hard (127 PPM) |
| 7 | Steger | Moderately Hard (146 PPM) |
| 8 | Custer Park | Moderately Hard (147 PPM) |
| 9 | Ottawa | Moderately Hard (147 PPM) |
| 10 | Abbott Park | Moderately Hard (148 PPM) |
All Cities in Illinois
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.
Abbott ParkModerately HardAbingdonHardAdairHardAddisonModerately HardAlbanyHardAlbersHardAlbionVery HardAledoVery HardAlexisVery HardAlhambraVery HardAllenVery HardAllendaleModerately HardAllertonHardAlmaHardAlortonVery HardAlphaVery HardAlseyVery HardAltamontHardAlto PassModerately HardAltonVery HardAltonaHardAlvinHardAmboyVery HardAnchorVery HardAnconaHardAndalusiaVery HardAndoverVery HardAndrewModerately HardAnnaModerately HardAnnapolisVery HardAnnawanVery HardAntiochModerately HardApple RiverVery HardArcadiaVery HardArcolaVery HardArenzvilleVery HardArgoModerately HardArgonneModerately HardArlingtonVery HardArlington HeightModerately HardArmingtonModerately HardArmstrongHardAroma ParkHardArrowsmithVery HardArthurVery HardAshkumHardAshleyVery HardAshmoreVery HardAshtonVery HardAssumptionHardAstoriaVery HardAtkinsonVery HardAtlantaHardAtterburyVery HardAtwoodVery HardAuburnModerately HardAugustaVery HardAuroraModerately HardAvaVery HardAvistonVery HardAvonVery HardBaderVery HardBaileyvilleModerately HardBaldwinVery HardBarclayModerately HardBardolphHardBarnhillHardBarrHardBarringtonModerately HardBarryVery HardBarstowVery HardBartelsoVery HardBartonvilleModerately HardBascoVery HardBataviaModerately HardBatchtownVery HardBatesModerately HardBaylisVery HardBeardstownVery HardBearsdaleModerately HardBeasonHardBeavervilleSlightly HardBeckemeyerVery HardBedford ParkModerately HardBeecherModerately HardBeecher CityHardBelknapHardBelle RiveHardBellevilleVery HardBellflowerVery HardBellmontVery HardBellwoodModerately HardBelvidereVery HardBementVery HardBenldVery HardBensenvilleModerately HardBensonHardBentonSlightly HardBerryModerately HardBerwickModerately HardBethaltoVery HardBethanyVery HardBible GroveHardBig RockModerately HardBiggsVery HardBiggsvilleVery HardBinghamVery HardBishop HillVery HardBismarckHardBlackstoneHardBlandinsvilleHardBloomingdaleModerately HardBloomingtonVery HardBlue IslandModerately HardBlue MoundModerately HardBlufordHardBolingbrookModerately HardBoliviaModerately HardBondvilleVery HardBone GapVery HardBonfieldHardBonnieHardBoodyModerately HardBourbonnaisHardBowenVery HardBracevilleVery HardBradfordVery HardBradleyHardBraidwoodModerately HardBreeseVery HardBridgeportVery HardBridgeviewModerately HardBrightonHardBrimfieldModerately HardBristolVery HardBroadlandsVery HardBroadviewModerately HardBroadwellHardBroctonVery HardBrookfieldModerately HardBroughtonVery HardBrownfieldHardBrownsHardBrownstownVery HardBrunswickVery HardBryantVery HardBuckinghamHardBuckleyVery HardBucknerModerately HardBudaVery HardBuffalo GroveModerately HardBuffalo HartModerately HardBulpittModerately HardBuncombeModerately HardBunker HillVery HardBurbankModerately HardBureauModerately HardBurlingtonModerately HardBurnhamModerately HardBurnt PrairieVery HardBushnellHardButlerModerately HardByronVery HardCaberyHardCahokiaVery HardCairoHardCaledoniaVery HardCalhounVery HardCalumet CityModerately HardCalumet ParkModerately HardCamargoVery HardCambriaSlightly HardCambridgeVery HardCamdenVery HardCameronModerately HardCamp GroveVery HardCamp PointVery HardCampbell HillVery HardCampusHardCantonVery HardCantrallModerately HardCapronVery HardCarbon CliffVery HardCarbondaleVery HardCarlockVery HardCarlyleVery HardCarmanVery HardCarmiVery HardCarol StreamModerately HardCarpentersvilleModerately HardCarrier MillsSlightly HardCarrolltonHardCartervilleSlightly HardCarthageVery HardCaryVery HardCaseyVery HardCaseyvilleVery HardCastletonVery HardCatlinHardCave In RockVery HardCazenoviaHardCedar PointModerately HardCedarvilleVery HardCentraliaHardCerro GordoVery HardChadwickVery HardChambersburgVery HardChampaignVery HardChanaModerately HardChannahonModerately HardChapinVery HardCharlestonVery HardChathamModerately HardChatsworthHardChebanseHardChenoaVery HardCherryModerately HardCherry ValleyVery HardChesterHardChestnutHardChicagoModerately HardChicago RidgeModerately HardChillicotheHardChrismanVery HardChristopherHardCiceroModerately HardCimicModerately HardCiscoVery HardCisneVery HardCissna ParkVery HardClareHardClaremontHardClarendon HillsModerately HardClarksburgHardClarksdaleModerately HardClay CityHardClaytonVery HardClaytonvilleModerately HardClementsVery HardCliftonHardClintonVery HardCoal CityVery HardCoal ValleyVery HardCoatsburgVery HardCobdenModerately HardCoelloModerately HardCoffeenVery HardColchesterHardColfaxVery HardCollinsvilleVery HardCollisonHardColmarHardColpSlightly HardColumbiaVery HardComerModerately HardComptonVery HardConcordVery HardCongervilleVery HardCooksvilleVery HardCordovaVery HardCornlandHardCortlandHardCottage HillsVery HardCountry Club HilModerately HardCowdenHardCreal SpringsSlightly HardCrescent CityVery HardCrestonHardCrestwoodModerately HardCreteModerately HardCropseyVery HardCrossvilleVery HardCrystal LakeVery HardCubaVery HardCullomHardCuster ParkModerately HardCutlerVery HardCypressVery HardDahindaHardDahlgrenVery HardDakotaVery HardDaleHardDalton CityVery HardDalzellVery HardDanaModerately HardDanforthHardDanversVery HardDanvilleHardDarienModerately HardDavisVery HardDavis JunctionVery HardDawsonModerately HardDe KalbHardDe LandModerately HardDe SotoVery HardDecaturModerately HardDeer CreekModerately HardDeer GroveHardDeerfieldModerately HardDelavanModerately HardDennisonModerately HardDepueVery HardDes PlainesModerately HardDeweyVery HardDewittModerately HardDieterichHardDixHardDixonVery HardDollvilleVery HardDoltonModerately HardDongolaModerately HardDonnellsonVery HardDonovanSlightly HardDorchesterHardDorseyVery HardDoverModerately HardDowHardDowellVery HardDowners GroveModerately HardDu BoisVery HardDu QuoinVery HardDundasHardDundeeModerately HardDunfermlineVery HardDunkelModerately HardDunlapModerately HardDupoVery HardDurandVery HardDwightHardEagarvilleVery HardEarlvilleVery HardEast AltonVery HardEast CarondeletVery HardEast DubuqueVery HardEast GalesburgHardEast LynnHardEast MolineVery HardEast PeoriaHardEast Saint LouisVery HardEckardVery HardEddyvilleVery HardEdelsteinModerately HardEdinburgHardEdwardsModerately HardEdwardsvilleVery HardEffinghamHardEganVery HardEl PasoVery HardElburnModerately HardEldenaVery HardEldoradoVery HardEldredHardElginModerately HardElizabethVery HardElizabethtownVery HardElk Grove VillagModerately HardElkvilleVery HardElleryHardElliottVery HardEllis GroveVery HardEllisvilleVery HardEllsworthVery HardElmhurstModerately HardElmwoodModerately HardElsahHardElvastonHardElwinModerately HardElwoodModerately HardEmdenHardEmingtonHardEnergySlightly HardEnfieldVery HardEolaModerately HardEqualityVery HardErieHardEsmondHardEssexHardEurekaVery HardEvanstonModerately HardEvansvilleVery HardEwingSlightly HardExeterVery HardFairburyHardFairfieldVery HardFairmountHardFairviewVery HardFairview HeightsVery HardFancy PrairieVery HardFarinaHardFarmer CityVery HardFarmingdaleModerately HardFentonHardFerrisVery HardFidelityHardFieldonHardFillmoreVery HardFisherVery HardFithianHardFlanaganHardFlat RockVery HardFloraHardFlossmoorModerately HardFooslandVery HardForest CityVery HardForest ParkModerately HardForrestHardForrestonVery HardForsythModerately HardFowlerVery HardFox LakeModerately HardFox River GroveVery HardFrankfortModerately HardFranklin GroveVery HardFranklin ParkModerately HardFrederickVery HardFreeburgVery HardFreeportVery HardFultonHardFultsVery HardGages LakeModerately HardGalatiaSlightly HardGaleHardGalenaVery HardGalesburgHardGaltHardGalvaVery HardGarden PrairieVery HardGardnerVery HardGaysModerately HardGeffVery HardGeneseoVery HardGenevaModerately HardGenoaHardGeorgetownVery HardGerlawVery HardGerman ValleyVery HardGermantownHardGibson CityVery HardGiffordVery HardGilbertsModerately HardGilmanHardGilsonHardGladstoneVery HardGlasfordModerately HardGlasgowVery HardGlen CarbonVery HardGlen EllynModerately HardGlenarmModerately HardGlencoeModerately HardGlendale HeightsModerately HardGlenviewModerately HardGlenwoodModerately HardGodfreyVery HardGoldenVery HardGolden EagleVery HardGolden GateHardGolfModerately HardGood HopeHardGoodfieldVery HardGorevilleModerately HardGorhamVery HardGraftonHardGrand ChainVery HardGrand RidgeModerately HardGrand TowerVery HardGrandviewModerately HardGrant ParkHardGrantsburgVery HardGranvilleVery HardGraymontHardGrayvilleVery HardGreat LakesModerately HardGreen RockVery HardGreen ValleyModerately HardGreenfieldHardGreenvilleVery HardGridleyVery HardGriggsvilleVery HardGrovelandModerately HardGurneeModerately HardHagamanHardHamburgVery HardHamelVery HardHamiltonVery HardHammondVery HardHampshireModerately HardHamptonVery HardHanna CityModerately HardHanoverVery HardHanover ParkModerately HardHardinVery HardHarmonVery HardHarrisburgVery HardHarristownModerately HardHartfordVery HardHartsburgHardHarvardVery HardHarvelVery HardHarwood HeightsModerately HardHazel CrestModerately HardHazel DellHardHebronVery HardHemanModerately HardHendersonHardHennepinHardHenningHardHenryVery HardHerodHardHerrickHardHerrinSlightly HardHerscherHardHervey CityModerately HardHettickHardHewittsvilleModerately HardHeyworthVery HardHickory HillsModerately HardHidalgoHardHighlandVery HardHighland ParkModerately HardHighwoodModerately HardHillsboroVery HardHillsdaleVery HardHillsideModerately HardHillviewVery HardHinckleyHardHindsboroHardHinesModerately HardHodgkinsModerately HardHoffmanVery HardHoffman EstatesModerately HardHolderVery HardHomerVery HardHometownModerately HardHomewoodModerately HardHoopestonVery HardHopedaleModerately HardHoyletonVery HardHublyVery HardHudsonVery HardHullVery HardHumboldtVery HardHumeHardHuntleyVery HardHuntsvilleVery HardHurstSlightly HardHutsonvilleVery HardIllinois CityVery HardIlliopolisModerately HardInaHardIndianolaHardIndustryHardInglesideModerately HardIngrahamModerately HardIpavaVery HardIroquoisModerately HardIrvingVery HardIrvingtonVery HardIsland LakeVery HardItascaModerately HardIukaHardIvesdaleVery HardJacobVery HardJeromeModerately HardJerseyvilleHardJewettHardJohnsonvilleModerately HardJohnston CitySlightly HardJolietModerately HardJonesboroModerately HardJoppaHardJoyVery HardJunctionHardJusticeModerately HardKampsvilleVery HardKaneVery HardKankakeeHardKansasVery HardKarnakModerately HardKasbeerModerately HardKeenesModerately HardKeensburgVery HardKeithsburgVery HardKellHardKemptonHardKenilworthModerately HardKenneyModerately HardKentVery HardKewaneeVery HardKeyesportVery HardKilbourneVery HardKincaidModerately HardKinderhookVery HardKingstonHardKingston MinesModerately HardKinmundyHardKinsmanVery HardKirklandHardKirkwoodVery HardKnoxvilleHardLa FayetteVery HardLa HarpeVery HardLa MoilleVery HardLa PlaceModerately HardLa PrairieVery HardLa RoseHardLa SalleVery HardLacledeHardLaconHardLaddVery HardLake BluffModerately HardLake ForestModerately HardLake ForkHardLake In The HillVery HardLakewoodVery HardLanarkVery HardLaneModerately HardLansingModerately HardLathamHardLauraModerately HardLawrencevilleVery HardLaytonVery HardLe RoyVery HardLebanonVery HardLeeVery HardLee CenterVery HardLelandVery HardLenaVery HardLenzburgVery HardLeonoreModerately HardLernaVery HardLewistownVery HardLexingtonVery HardLibertyVery HardLibertyvilleModerately HardLimaVery HardLincolnHardLincolnwoodModerately HardLindenhurstModerately HardLindenwoodVery HardLisleModerately HardLitchfieldModerately HardLittle IndianVery HardLittle YorkVery HardLittletonHardLiverpoolVery HardLivingstonVery HardLoamiModerately HardLodaVery HardLomaxVery HardLombardModerately HardLondon MillsVery HardLong GroveModerately HardLong PointHardLongviewVery HardLoraineVery HardLostantVery HardLovejoyVery HardLoves ParkVery HardLovingtonVery HardLudlowVery HardLutherVery HardLynchburgVery HardLyndonHardLynn CenterVery HardLyonsModerately HardMacedoniaSlightly HardMachesney ParkVery HardMackinawModerately HardMacombHardMaconModerately HardMadisonVery HardMagnoliaModerately HardMahometVery HardMakandaVery HardMaldenVery HardMaltaHardManchesterVery HardManhattanModerately HardManitoVery HardManliusModerately HardMansfieldVery HardMantenoHardManvilleHardMaple ParkModerately HardMapletonModerately HardMaquonHardMarengoVery HardMariettaVery HardMarineVery HardMarionSlightly HardMarissaVery HardMarkVery HardMarkhamModerately HardMaroaModerately HardMarseillesModerately HardMarshallVery HardMartinsvilleVery HardMartintonModerately HardMaryvilleVery HardMascoutahVery HardMasonHardMathervilleHardMattesonModerately HardMattoonVery HardMaunieHardMazonVery HardMc ClureHardMc ConnellVery HardMc Gaw ParkModerately HardMc HenryVery HardMc LeanVery HardMc LeansboroVery HardMc NabbHardMcveyModerately HardMediaVery HardMedinahModerately HardMedoraVery HardMellon FinancialModerately HardMelrose ParkModerately HardMelvinVery HardMendonVery HardMendotaVery HardMeppenVery HardMerrionette ParkModerately HardMetamoraVery HardMetcalfVery HardMetropolisHardMiddlegroveVery HardMiddletownHardMilanVery HardMilfordVery HardMill ShoalsVery HardMillbrookVery HardMilledgevilleVery HardMiller CityVery HardMillingtonVery HardMillstadtVery HardMilmineModerately HardMiltonVery HardMineralVery HardMinierModerately HardMinonkHardMinookaVery HardMitchellVery HardModeModerately HardModestoModerately HardModocVery HardMokenaModerately HardMolineVery HardMomenceHardMoneeModerately HardMonmouthVery HardMonroe CenterVery HardMontgomeryHardMonticelloVery HardMontroseModerately HardMooseheartModerately HardMoroVery HardMorrisVery HardMorrisonHardMorrisonvilleModerately HardMortonModerately HardMorton GroveModerately HardMossvilleModerately HardMound CityModerately HardMoundsModerately HardMount AuburnHardMount CarmelModerately HardMount CarrollVery HardMount ErieVery HardMount MorrisVery HardMount OliveVery HardMount ProspectModerately HardMount PulaskiHardMount SterlingVery HardMount VernonHardMulberry GroveVery HardMulkeytownHardMuncieHardMundeleinModerately HardMurdockHardMurphysboroVery HardNachusaVery HardNapervilleModerately HardNaplesVery HardNashvilleVery HardNauvooHardNeboVery HardNeogaHardNeponsetVery HardNew AthensVery HardNew BadenHardNew BedfordVery HardNew BostonVery HardNew BurnsideSlightly HardNew CantonVery HardNew DouglasVery HardNew HavenVery HardNew HollandHardNew LenoxModerately HardNew LibertyHardNew MemphisHardNew SalemVery HardNew WindsorVery HardNewarkVery HardNewburgModerately HardNewmanVery HardNewmansvilleVery HardNewtonHardNianticModerately HardNilesModerately HardNilwoodModerately HardNiotaVery HardNobleVery HardNokomisVery HardNoraVery HardNormalVery HardNormandyVery HardNorridgeModerately HardNorris CityVery HardNorth AuroraModerately HardNorth HendersonHardNorth RiversideModerately HardNorthbrookModerately HardNorthfieldModerately HardNorthlakeModerately HardNortonvilleVery HardOak BrookModerately HardOak ForestModerately HardOak LawnModerately HardOak ParkModerately HardOakdaleVery HardOakfordVery HardOaklandVery HardOakwoodHardOblongVery HardOconeeVery HardOdellHardOdinHardOgdenVery HardOglesbyVery HardOhioVery HardOkawvilleVery HardOlive BranchModerately HardOlmstedModerately HardOlneyModerately HardOlympia FieldsModerately HardOmahaVery HardOnargaHardOneidaHardOpdykeHardOpheimVery HardOquawkaVery HardOrangevilleVery HardOreanaModerately HardOregonVery HardOrientSlightly HardOrionVery HardOrland ParkModerately HardOrleansVery HardOscoVery HardOswegoVery HardOttawaModerately HardOwanecoModerately HardOzarkHardPalatineModerately HardPalestineVery HardPalomaVery HardPalos HeightsModerately HardPalos HillsModerately HardPalos ParkModerately HardPanamaVery HardPanther CreekVery HardParisVery HardPark RidgeModerately HardParkersburgModerately HardPatokaHardPattersonVery HardPaw PawVery HardPaxtonVery HardPaysonVery HardPearlVery HardPearl CityVery HardPecatonicaVery HardPekinHardPenfieldVery HardPeoriaModerately HardPeoria HeightsHardPeotoneModerately HardPercyVery HardPerryVery HardPeruVery HardPesotumVery HardPhiloVery HardPiasaVery HardPierronVery HardPinckneyvilleVery HardPiper CityHardPittsburgSlightly HardPittsfieldVery HardPlainfieldModerately HardPlainvilleVery HardPlanoVery HardPleasant HillVery HardPocahontasVery HardPoloVery HardPomonaVery HardPontiacHardPontoosucVery HardPoplar GroveVery HardPort ByronVery HardPosenModerately HardPotomacHardPrairie CityHardPrairie Du RocheVery HardPrairie ViewModerately HardPreemptionVery HardPrincetonVery HardPrincevilleModerately HardProphetstownHardProspect HeightsModerately HardPulaskiModerately HardPutnamModerately HardQuincyVery HardRadfordVery HardRadomVery HardRaleighVery HardRamseyHardRankinHardRansomModerately HardRantoulVery HardRaritanVery HardRaymondVery HardRed BudHardReddickHardRedmonHardRenaultVery HardReynoldsVery HardRichmondVery HardRichton ParkModerately HardRichviewVery HardRidge FarmHardRidgwayVery HardRidottVery HardRinardModerately HardRingwoodVery HardRioHardRiver ForestModerately HardRiver GroveModerately HardRoanokeHardRobbinsModerately HardRobbsVery HardRobertsVery HardRobinsonVery HardRochelleVery HardRock CityVery HardRock FallsHardRock IslandVery HardRockbridgeVery HardRockdaleModerately HardRockfordVery HardRockportVery HardRocktonVery HardRockwoodVery HardRolling MeadowsModerately HardRomeovilleModerately HardRoodhouseVery HardRosamondModerately HardRoscoeVery HardRoselleModerately HardRosemontModerately HardRosevilleVery HardRosiclareHardRossvilleHardRound LakeModerately HardRoxanaVery HardRoyalVery HardRoyal LakesHardRoyaltonHardRutlandHardSadorusVery HardSailor SpringsModerately HardSaint AnneHardSaint AugustineHardSaint CharlesModerately HardSaint DavidVery HardSaint ElmoVery HardSaint FrancisvilModerately HardSaint JacobVery HardSaint JosephVery HardSaint PeterVery HardSainte MarieHardSalemHardSandovalHardSandwichHardSaugetVery HardSauk VillageModerately HardSauneminHardSavannaVery HardSavoyVery HardSawyervilleVery HardSaybrookVery HardScales MoundVery HardSchaumburgModerately HardSchellerHardSchiller ParkModerately HardSciotaHardScott A F BVery HardSeatonVery HardSeatonvilleVery HardSecorVery HardSenecaVery HardSerenaModerately HardSesserHardSewardVery HardSeymourVery HardShabbonaHardShannonVery HardShawneetownVery HardSheffieldVery HardSheldonSlightly HardSheridanVery HardSherrardHardShilohVery HardShirleyVery HardShobonierVery HardShorewoodModerately HardShumwayHardSibleyVery HardSicilyModerately HardSidellHardSidneyVery HardSigelModerately HardSilvisVery HardSimsVery HardSkokieModerately HardSmithboroVery HardSmithfieldVery HardSmithshireModerately HardSmithtonVery HardSomonaukVery HardSorentoVery HardSouth BeloitVery HardSouth ElginModerately HardSouth HollandModerately HardSouth PekinModerately HardSouth RoxanaVery HardSouth WilmingtonVery HardSouthern ViewModerately HardSparlandVery HardSpartaHardSpauldingModerately HardSpeerVery HardSpring GroveVery HardSpring ValleyVery HardSpringertonVery HardSpringfieldModerately HardStandardVery HardStanfordVery HardStauntonVery HardSteelevilleVery HardStegerModerately HardSterlingHardStewardVery HardStewardsonHardStickneyModerately HardStillman ValleyVery HardStocklandModerately HardStocktonVery HardStone ParkModerately HardStonefortHardStoningtonHardStrasburgModerately HardStrawnHardStreamwoodModerately HardStreatorHardStronghurstVery HardSubletteVery HardSugar GroveModerately HardSullivanVery HardSummerfieldVery HardSumnerVery HardSunnylandModerately HardSutterVery HardSwanwickVery HardSycamoreHardTable GroveVery HardTallulaVery HardTamaroaVery HardTammsModerately HardTampicoHardTaylor RidgeVery HardTaylor SpringsVery HardTennesseeHardTeutopolisHardTexicoHardThawvilleVery HardThayerModerately HardThomasboroVery HardThomasvilleVery HardThompsonvilleSlightly HardThomsonVery HardThorntonModerately HardTildenVery HardTiltonHardTimewellVery HardTinley ParkModerately HardTiskilwaVery HardToledoHardTolonoVery HardTolucaVery HardTonicaVery HardTopekaVery HardToulonVery HardToveyModerately HardTowandaVery HardTremontModerately HardTrentonHardTrillaModerately HardTrivoliModerately HardTroyVery HardTroy GroveModerately HardTuscolaVery HardUllinModerately HardUnionVery HardUnion HillHardUniversity ParkModerately HardUrbanaVery HardUrsaVery HardUticaVery HardValierSlightly HardValmeyerVery HardVan OrinVery HardVandaliaVery HardVarnaModerately HardVenedyVery HardVeniceVery HardVergennesVery HardVermontVery HardVernonHardVernon HillsModerately HardVeronaVery HardVersaillesVery HardVictoriaHardViennaModerately HardVilla GroveHardVilla ParkModerately HardVilla RidgeVery HardViolaHardVirdenModerately HardWadsworthModerately HardWaggonerVery HardWalnut HillHardWalshVery HardWalshvilleVery HardWaltonvilleHardWapellaVery HardWarrenVery HardWarrenvilleModerately HardWarsawHardWashburnHardWashington ParkVery HardWatagaHardWaterlooVery HardWatermanHardWatsekaVery HardWatsonHardWaucondaModerately HardWaukeganModerately HardWaverlyVery HardWayneModerately HardWayne CityVery HardWaynesvilleVery HardWedronModerately HardWeldonVery HardWellingtonModerately HardWenonaHardWest BrooklynVery HardWest ChicagoModerately HardWest FrankfortSlightly HardWest LibertyHardWest PointVery HardWest SalemVery HardWest UnionVery HardWest YorkVery HardWestchesterModerately HardWestern SpringsModerately HardWestfieldVery HardWestmontModerately HardWestvilleVery HardWheatonModerately HardWheelerHardWheelingModerately HardWhite HallVery HardWhite HeathVery HardWhittingtonHardWilliamsfieldHardWilliamsvilleModerately HardWillisvilleVery HardWillow HillHardWillow SpringsModerately HardWilmetteModerately HardWilsonvilleVery HardWindsorHardWinfieldModerately HardWinnebagoVery HardWinslowVery HardWinthrop HarborModerately HardWittVery HardWolf LakeModerately HardWonder LakeVery HardWood DaleModerately HardWood RiverVery HardWoodhullVery HardWoodlandVery HardWoodlawnHardWoodridgeModerately HardWoodsonVery HardWoodstockVery HardWoosungModerately HardWordenVery HardWorld Of BeautyModerately HardWorthModerately HardWyanetVery HardWyomingVery HardXeniaHardYaleHardYates CityHardYorkvilleVery HardZeiglerHardZionModerately Hard