How does Creve Coeur's water compare to the national average?

The USA national average is 151 mg/L. Creve Coeur (≈ 120–179 mg/L) is 1 mg/L softer than average.

Creve Coeur Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

river

pH Level

8.5

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

623.7 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · 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 Creve Coeur, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Creve Coeur	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Creve Coeur compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Creve Coeur, Missouri	≈ 120–179 mg/L	7.6 ppt	🟠 Hard	river
Maryland Heights, Missouri	164 mg/L	5.5 ppt	🟠 Hard	river
Town and Country, Missouri	≈ 120–179 mg/L	3.6 ppt	🟠 Hard	river
Overland, Missouri	≈ 120–179 mg/L	4.8 ppt	🟠 Hard	groundwater
Saint Ann, Missouri	≈ 120–179 mg/L	3.7 ppt	🟠 Hard	river

National Benchmark

How Creve Coeur compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Creve Coeur	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Creve Coeur's Water Unique?

Local geology and source profile

Source: RiverTDS: 623.7 mg/LpH: 8.5

Creve Coeur Municipal Water serves Creve Coeur in St. Louis County, Missouri, drawing approximately 80% from the Missouri River and 20% from the Meramec River. Treatment is carried out at facilities operated by the St. Louis County Water Company, under oversight of the Missouri Department of Natural Resources. This mixed surface water system serves residential and commercial customers across the city's approximately 6 square miles, providing reliable potable water to the community.

The Missouri-Mississippi river basin watershed is underlain by ancient carbonate formations, including Mississippian Burlington Limestone and Ordovician dolomites such as the Kimmswick and Plattin limestones. These soluble rocks release calcium and magnesium ions into the river systems as they erode, producing a characteristically hard supply. Glacial till and loess overburden across the region further enhance mineral leaching into surface waters, and seasonal agricultural and urban runoff can influence overall water chemistry.

Hard water in Creve Coeur causes scale buildup in dishwashers, washing machines, water heaters, and coffee makers, reducing efficiency and shortening appliance lifespan. Soap scum on fixtures and skin dryness are common household effects. Regular vinegar descaling, installing drain screens, and flushing water heaters helps mitigate buildup. A water softener is recommended to prevent mineral accumulation and improve appliance performance. Treatment includes coagulation, filtration, disinfection, and corrosion control; recent reports confirm lead and copper compliance at the tap.

Geology & Source: Missouri River + Meramec River watersheds; Mississippian limestone and dolomite, Ordovician Kimmswick and Plattin limestones; glacial till and loess overburden — soluble carbonates dissolve calcium and magnesium, producing hard supply

Other Missouri Water Reports

Maryland Heights

164 mg/L

🟠 Hard

Town and Country

≈ 120–179 mg/L

🟠 Hard

Overland

≈ 120–179 mg/L

🟠 Hard

Saint Ann

≈ 120–179 mg/L

🟠 Hard

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Frequently Asked Questions

Is Creve Coeur's water safe to drink?

Yes. Creve Coeur's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Creve Coeur?

At ≈ 120–179 mg/L (Hard), Creve Coeur's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Creve Coeur compare to the USA average?

The USA national average is 151 mg/L. Creve Coeur (≈ 120–179 mg/L) is 1 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 Creve Coeur 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.