How does Aurora's water compare to the national average?

The USA national average is 151 mg/L. Aurora (≈ 60–119 mg/L) is 61 mg/L softer than average.

Aurora Water Hardness & Quality Report (2026)

Water Hardness

moderately hard

~60–119 mg/L

Moderately Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

356.5 mg/L

Est. Daily Cost

$0.24

energy & soap waste

Source: See methodology section below · Updated 2026

moderately hard~60–119 mg/LModerately Hard · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Aurora, your appliances are currently losing 12% efficiency due to mineral buildup.

Appliance	In Aurora	Soft Water City	Efficiency Loss
Kettle	7.5 yrs	8.5 yrs	-12%
Washing Machine	10.6 yrs	12 yrs	-12%
Water Heater	13.2 yrs	15 yrs	-12%

Regional Water Comparison

How Aurora compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Aurora, Colorado	≈ 60–119 mg/L	12 ppt	🟡 Moderately Hard	reservoir
Cherry Creek, Colorado	≈ 120–179 mg/L	4.6 ppt	🟠 Hard	reservoir
Commerce City, Colorado	≈ 180+ mg/L	85.9 ppt	🔴 Very Hard	reservoir
Denver, Colorado	≈ 60–120 mg/L	2 ppt	🟡 Moderately Hard	reservoir
Centennial, Colorado	≈ 180+ mg/L	3.7 ppt	🔴 Very Hard	reservoir

National Benchmark

How Aurora compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Aurora	≈ 60–119 mg/L	🟡 Low
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Aurora's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 356.5 mg/LpH: 8

The City of Aurora Water Division provides drinking water to over 400,000 residents across Arapahoe, Adams, and Douglas counties in the Denver metropolitan area. Primary sources include the South Platte River diverted via Rueter-Hess Reservoir and other Front Range reservoirs, supplemented by groundwater from 17 wells tapping the Denver Basin aquifers. Water is treated at the Prairie Waters facility — featuring advanced membrane filtration and UV disinfection — the Arapahoe Water Treatment Plant, and multiple wellhead treatment sites serving the distribution system.

Aurora's supply originates in the South Platte River Basin, spanning Rocky Mountain headwaters to the High Plains. Upstream geology transitions from Precambrian igneous and metamorphic rocks to Cretaceous formations including the Pierre Shale and Niobrara Formation, with alluvial gravels overlying the Denver Basin aquifers. Groundwater from the Arapahoe and Laramie-Fox Hills aquifers interacts with carbonate minerals in sandstone and conglomerate layers, while river water acquires additional mineralization through soil and rock dissolution, blending into a moderately hard mineral profile.

Moderate hardness causes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and raising energy costs. Regular maintenance — deliming heaters annually, using vinegar soaks on fixtures, and installing drain screens — helps extend appliance life. A water softener is often recommended; salt-free conditioners suit those avoiding sodium addition. Aurora's water meets all EPA standards with pH typically 7.5–8.5; treatment includes coagulation, filtration, chloramination, and advanced ozone and UV processes at Prairie Waters for comprehensive pathogen and contaminant control.

Geology & Source: Denver Basin aquifers — Arapahoe Formation (sandstone/gravel) and Laramie-Fox Hills Formation, Cretaceous–Tertiary; South Platte River through Precambrian granite and Pierre Shale — moderate hardness from carbonate-bearing sediments

Hardness Varies Across Aurora — Find Your Area

City average is ≈ 60–119 mg/L. Individual ZIP areas differ.

* ZIP code estimates are derived from the city-wide measurement. Actual readings may vary slightly by neighbourhood.

ZIP Code	Neighbourhood	Hardness (mg/L)	Risk Level
80010	Central Aurora	≈ 89	🟡 Moderately Hard
80040	Downtown Aurora	≈ 89	🟡 Moderately Hard
80011	Central North Aurora	≈ 90	🟡 Moderately Hard
80017	Southwest Aurora	≈ 90	🟡 Moderately Hard
80018	East Aurora	≈ 90	🟡 Moderately Hard
80019	Far Northeast Aurora	≈ 90	🟡 Moderately Hard
80044	Northeast Aurora	≈ 90	🟡 Moderately Hard
80012	Southeast Aurora	≈ 90	🟡 Moderately Hard
80013	Southeast Aurora East	≈ 90	🟡 Moderately Hard
80014	Southeast Aurora South	≈ 90	🟡 Moderately Hard
80015	Smoky Hill	≈ 90	🟡 Moderately Hard
80016	Southlands	≈ 90	🟡 Moderately Hard

Other Colorado Water Reports

Cherry Creek

≈ 120–179 mg/L

🟠 Hard

Commerce City

≈ 180+ mg/L

🔴 Very Hard

Denver

≈ 60–120 mg/L

🟡 Moderately Hard

Centennial

≈ 180+ mg/L

🔴 Very Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Aurora's water safe to drink?

Yes. Aurora's water meets all federal safety standards. The hardness is ≈ 60–119 mg/L (Moderately Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Aurora?

Aurora's water is moderately hard at ≈ 60–119 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Aurora compare to the USA average?

The USA national average is 151 mg/L. Aurora (≈ 60–119 mg/L) is 61 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Aurora is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.