Flint Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
234.1 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 Flint, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Flint | 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 Flint compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Flint, Michigan | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Burton, Michigan | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Beecher, Michigan | ≈ 120–179 mg/L | 8.4 ppt | 🟠 Hard | river |
| Fenton, Michigan | ≈ 180+ mg/L | 3.7 ppt | 🔴 Very Hard | groundwater |
| Waterford, Michigan | ≈ 180+ mg/L | 6.5 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Flint compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Flint | ≈ 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 Flint's Water Unique?
Local geology and source profile
The City of Flint Water Utility serves approximately 100,000 residents in Genesee County, Michigan. Water is sourced from the lower Lake Huron watershed, supplied via the Great Lakes Water Authority (GLWA) and the Karegnondi Water Authority (KWA) pipeline system. Water is processed at the GLWA Water Treatment Plant before distribution through Flint's municipal system. Over 97% of lead service lines have been replaced, with ongoing real-time monitoring stations supplementing required lead and copper testing under the Safe Drinking Water Act.
The lower Lake Huron watershed features short, seasonal tributaries shaped by Paleozoic sedimentary geology — specifically Devonian limestone and dolomite, including the Dundee and Bell Shale formations of the Middle Devonian period. These carbonate rock formations contribute to a hard supply through dissolution of calcium and magnesium, while the lake's vast volume moderates chemical extremes. Glacial deposits overlay the bedrock, potentially blending shallow groundwater influences that further enhance mineralization without significant softening.
At this moderately hard level, residents may notice limescale buildup in kettles, dishwashers, and water heaters, with spotting on glassware and reduced laundry efficiency over time. Regular vinegar descaling of appliances, cartridge filters for aerators, and detergent boosters are effective maintenance measures; a water softener is recommended for aesthetic concerns or to extend appliance life. Flint's water meets Safe Drinking Water Act requirements — the latest six-month lead monitoring recorded a 90th percentile of 10 ppb, below the 15 ppb action level, marking over seven years of compliance following the 2014–2015 crisis. The treatment process includes filtration, disinfection, and corrosion control, with the system now drawing from a secure Lake Huron source with modern infrastructure.
Geology & Source: Lower Lake Huron watershed — Middle Devonian limestone and dolomite (Dundee Formation, Bell Shale); carbonate bedrock leaches calcium and magnesium, producing hard supply; glacial drift overlies sedimentary layers
Other Michigan Water Reports
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Frequently Asked Questions
Is Flint's water safe to drink?
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How does Flint compare to the USA average?
Data Sources & Methodology
Water quality data for Flint 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.