Centralia Water Hardness & Quality Report (2026)
Water Hardness
0.9 grains per gallon
Source
groundwater
pH Level
7.3
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
24.1 mg/L
Est. Daily Cost
$0.04
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 Centralia, your appliances are currently losing 2% efficiency due to mineral buildup.
| Appliance | In Centralia | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 11.8 yrs | 12 yrs | -2% |
| Water Heater | 14.7 yrs | 15 yrs | -2% |
Regional Water Comparison
How Centralia compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Centralia, Washington | 15.5 mg/L | 32.4 ppt | 🟢 Soft | groundwater |
| Tumwater, Washington | ≈ 120–179 mg/L | 13.3 ppt | 🟠 Hard | groundwater |
| Olympia, Washington | ≈ 120–179 mg/L | 26.5 ppt | 🟠 Hard | groundwater |
| Lacey, Washington | ≈ 120–179 mg/L | 42.3 ppt | 🟠 Hard | groundwater |
| Joint Base Lewis McChord, Washington | 38 mg/L | 156.7 ppt | 🟢 Soft | groundwater |
National Benchmark
How Centralia compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Centralia | 15.5 mg/L | 🟢 None |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Centralia's Water Unique?
Local geology and source profile
The City of Centralia Public Works Department operates a groundwater-based water supply system, serving the city in Lewis County, Washington. Water is sourced from two primary well fields: the Tennis Court well field and the Port District well field. Both sources are classified as groundwater drawn from drilled wells within the Puget Sound Lowland aquifer system. The utility regularly tests for over 100 possible contaminants and publishes annual Consumer Confidence Reports documenting water quality compliance. Centralia's water originates from the Puget Sound Lowland aquifer, a Quaternary glacial deposit system overlying Tertiary sedimentary bedrock.
The groundwater passes through glacially deposited sand, gravel, and clay layers that contribute dissolved minerals and shape the water's chemical character. This geological setting is typical of western Washington's lowland regions, where glacial aquifers provide reliable groundwater supplies but are susceptible to contamination from surface sources. The Puget Sound Lowland aquifer system is composed of Quaternary glacial deposits overlying Tertiary sedimentary formations, which can affect the water's hardness. As a groundwater supply, Centralia's water exhibits characteristics typical of glacial aquifer systems in the region.
If you're experiencing scale buildup on appliances or plumbing, it's a good idea to consult the annual water quality report or contact the City of Centralia Water Department for site-specific hardness data and treatment recommendations. The utility's testing and public reports do not specify a hardness classification, though the water meets all EPA Maximum Contaminant Level Goals. Customers should also be aware that Centralia's 2024 water quality testing revealed PFAS compounds at low levels in some groundwater wells, and it's essential to stay informed about the water quality in your area.
Geology & Source: Puget Sound Lowland aquifer system; Quaternary glacial deposits - sand, gravel, clay overlying Tertiary sedimentary formations
Other Washington Water Reports
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Frequently Asked Questions
Is Centralia's water safe to drink?
Do I need a water softener in Centralia?
How does Centralia compare to the USA average?
Data Sources & Methodology
Water quality data for Centralia 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.