Hazelwood Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
442.5 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
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 Hazelwood, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Hazelwood | 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 Hazelwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hazelwood, Missouri | ≈ 120–179 mg/L | 6.3 ppt | 🟠 Hard | river |
| Bridgeton, Missouri | ≈ 120–179 mg/L | 3.7 ppt | 🟠 Hard | river |
| Saint Ann, Missouri | ≈ 120–179 mg/L | 3.7 ppt | 🟠 Hard | river |
| Florissant, Missouri | ≈ 120–179 mg/L | 5.1 ppt | 🟠 Hard | river |
| Overland, Missouri | ≈ 120–179 mg/L | 4.8 ppt | 🟠 Hard | groundwater |
National Benchmark
How Hazelwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hazelwood | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Hazelwood home
Shop water softeners on Amazon.com →
What Makes Hazelwood's Water Unique?
Local geology and source profile
Missouri American Water serves Hazelwood in St. Louis County, providing drinking water through its St. Louis region operations. The utility sources approximately 80% of its supply from the Missouri River, which borders the service area to the north and west, and 20% from the Meramec River. Treatment occurs at facilities managed by American Water, ensuring compliance with state and federal standards. Annual Water Quality Reports are available at amwater.com, and customers can reach service via 1-866-430-0820 or the utility's online portal.
The Missouri River watershed encompasses broad alluvial plains and dissected uplands underlain by extensive Paleozoic carbonate rock formations, including limestone and dolomite layers prevalent in the Ozark Plateaus. The Meramec River drains similar karst terrain featuring sinkholes and springs. Formations including the Burlington Limestone and Warsaw Formation are rich in calcium and magnesium carbonates; their karstic dissolution imparts a hard character to the water through natural leaching from aquifers and riverbed sediments, resulting in elevated dissolved mineral levels typical of Midwestern river systems.
Hard water in Hazelwood leads to moderate scale buildup in water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Limescale deposits form on faucets and fixtures, and laundry can appear dingy. Regular vinegar descaling, drain screens, and biannual water heater flushing are recommended; a water softener is advised to extend appliance life and improve soap efficiency. The 2025 Water Quality Report confirms EPA compliance with no violations; treatment involves coagulation, sedimentation, filtration, and disinfection using chloramines. Lead and copper tap sampling meets action levels; disinfection byproducts are monitored below MCLs.
Geology & Source: Missouri River and Meramec River watersheds; Paleozoic Ordovician-Mississippian limestones and dolomites including Burlington Limestone and Warsaw Formation — karst carbonate dissolution yields hard supply
Other Missouri Water Reports
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 Hazelwood's water safe to drink?
Do I need a water softener in Hazelwood?
How does Hazelwood compare to the USA average?
Data Sources & Methodology
Water quality data for Hazelwood is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
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.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
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.
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.
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.
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.