Kent Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
191.9 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 Kent, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Kent | 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 Kent compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kent, Washington | ≈ 120–179 mg/L | 3.4 ppt | 🟠 Hard | reservoir |
| Lakeland North, Washington | ≈ 120–179 mg/L | 2.3 ppt | 🟠 Hard | reservoir |
| East Hill-Meridian, Washington | ≈ 120–179 mg/L | 2.4 ppt | 🟠 Hard | reservoir |
| Auburn, Washington | ≈ 120–179 mg/L | 8 ppt | 🟠 Hard | groundwater |
| Lea Hill, Washington | ≈ 0–60 mg/L | 1.7 ppt | 🟢 Soft | reservoir |
National Benchmark
How Kent compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kent | ≈ 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 Kent's Water Unique?
Local geology and source profile
Kent Water Department serves approximately 79,000–130,000 residents in the City of Kent, Washington, located in King County within the greater Seattle metropolitan area. The utility sources water from groundwater aquifers beneath the Green River and Cedar River basins, extending both within and outside city limits. Water is delivered to homes, businesses, and landmarks including the ShoWare Center via an extensive distribution network. Treatment involves chlorine, chlorine dioxide, ozone, and UV light for disinfection, though no specific treatment plant names are detailed in available reports.
The primary watershed encompasses the Green River basin and adjacent Cedar River basin in the Puget Lowland, influenced by Cascade Range runoff. Aquifers consist of glacial outwash, alluvium, and interbedded sediments from Pleistocene glaciations by the Cordilleran Ice Sheet, overlying Tertiary Puget Group bedrock. This geology imparts a moderately mineralised character as dissolved ions from glacial tills, volcaniclastics, and metamorphic rocks contribute to groundwater chemistry, distinguishing it from the softer high-mountain snowmelt sources common in the region.
At moderately hard levels, scale buildup occurs in pipes, water heaters, and dishwashers, reducing efficiency and lifespan. Kettles and faucets may show white deposits; laundry may feel less soft. Regular vinegar descaling, low-flow aerators, and magnetic descalers help mitigate effects. A water softener is recommended for households with noticeable spotting or appliance issues. Water quality earns an A grade overall; however, notable issues include trihalomethanes (TTHMs), chromium-6, and disinfection byproducts exceeding advocacy levels, detected in testing by Kent City PWS, while pH, lead, and copper compliance is maintained.
Geology & Source: Green River and Cedar River basin aquifers — Puget Sound lowland Pleistocene glacial and alluvial deposits (sands, gravels, silts) over Tertiary Puget Group bedrock; calcium and magnesium from volcaniclastics yield moderately mineralised water
Other Washington Water Reports
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Frequently Asked Questions
Is Kent's water safe to drink?
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How does Kent compare to the USA average?
Data Sources & Methodology
Water quality data for Kent 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.