Where does the water in 61817 come from?

Water for zip code 61817 in Catlin, Illinois is provided by 2 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 61817

Catlin, Illinois · Vermilion County

241 PPM

14.1 GPG

Hard

0Soft60120180300+

High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 2 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 2 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

2 USGS-backed sources

2 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 61817

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

2 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Aqua Illinois-Vermilion County IL1835120	surface water	206 PPM Hard	30,106	High Confidence — USGS Monitoring
Catlin IL1830150	surface water	680 PPM Very Hard	2,380	High Confidence — USGS Monitoring

Aqua Illinois-Vermilion County

IL1835120

Hard

206 PPMsurface water30,106 servedHigh Confidence — USGS Monitoring

Catlin

IL1830150

Very Hard

680 PPMsurface water2,380 servedHigh Confidence — USGS Monitoring

Nearby Zip Codes

61883273 61841219 61833206 61846287 61858241 61850206 61832206 61834206 61857206 61870227 61844215 61876216

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Hard Water - Treatment Recommended

Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.

Recommended Products

Salt-Based Water Softener

Our PickAFWFilters Fleck 5600SXT 48K Also GreatWhirlpool WHES40E 40K Also GreatAFWFilters 64K Grain Also GreatAFWFilters Iron Pro 2 64K Also GreatSpringWell Filter + Softener Combo

Salt-Free Water Conditioner

Our PickSpringWell Salt-Free Cartridge

Water Hardness Test Kit

Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)

Shower Head Filter

Our PickWeddell Duo Also GreatAquaBliss SF100 Also GreatSprite Pure 7-Setting Also GreatAqua Earth 20-Stage

Water Softener Salt

Our PickMorton Clean & Protect Also GreatDiamond Crystal Bright & Soft

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your Water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Catlin, IL (61817).

Submit Your Data

Frequently Asked Questions

Is the water hard in Catlin, IL (61817)?

The average water hardness in 61817 is 241 PPM (14.1 GPG), which is classified as hard.

Do I need a water softener in 61817?

With hardness of 241 PPM, a water softener is recommended for homes in 61817.

Is hard water in 61817 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 61817?

Zip code 61817 in Catlin, Illinois is served by 2 water systems.