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Water Hardness in Aurora, CO

Colorado · 8 zip codes · 30 matched water systems

90 PPM
5.3 GPG
Slightly Hard
0Soft60120180300+
Verified — Annual Water Quality Report

City avg (weighted): 90 PPM

Dataset updated March 9, 202630 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading
Aurora City Of
CO0103005
Water source: surface water
Serves: 533,407
USGS environmental estimate: 102 PPM
Source context

How this city reading is built

This city reading is a weighted rollup across 30 matched water systems and 8 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
30 verified treated-water sources
30 matched systems total for this city; treated-water reports are prioritized when available.
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 in Aurora

These systems are matched to Aurora, CO. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

30 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.
Aurora City Of
CO0103005
Slightly Hard
90 PPMsurface water533,407 servedVerified — Annual Water Quality Report
Source water: 102 PPM
Thornton City Of
CO0101150
Slightly Hard
90 PPMsurface water226,465 servedVerified — Annual Water Quality Report
Source water: 156 PPM
Westminster City Of
CO0101170
Slightly Hard
90 PPMsurface water202,078 servedVerified — Annual Water Quality Report
Source water: 158 PPM
South Adams County Wsd
CO0101140
Slightly Hard
90 PPMsurface water74,341 servedVerified — Annual Water Quality Report
Source water: 58 PPM
East Cherry Creek Valley Wsd
CO0103035
Slightly Hard
90 PPMsurface water66,130 servedVerified — Annual Water Quality Report
Source water: 102 PPM
Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Aurora, CO

80010908001190800129080013908001490800179080018908001990

What This Means For You

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

Slightly Hard Water

Your water is slightly hard. You may notice minor spotting on dishes or a slight film on faucets. A water softener is optional but can improve water quality.

Recommended Products

Water Hardness Test Kit
Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)
Salt-Free Water Conditioner
Our PickSpringWell Salt-Free Cartridge

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | 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 Aurora, CO.

Submit Your Data

Frequently Asked Questions

How hard is the water in Aurora, CO?

The citywide weighted average water hardness in Aurora, CO is 90 PPM (5.3 GPG), classified as slightly hard. This is based on 30 matched water systems.

Do I need a water softener in Aurora, CO?

At 90 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Aurora, CO 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 Aurora, CO?

Aurora, Colorado is served by 30 matched water systems across 8 zip codes.

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