How does Bonney Lake's water compare to the national average?

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

Bonney Lake Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.3

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

62.5 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 Bonney Lake, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Bonney Lake	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 Bonney Lake compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Bonney Lake, Washington	≈ 120–179 mg/L	1.9 ppt	🟠 Hard	reservoir
Prairie Ridge, Washington	74.5 mg/L	3.2 ppt	🟡 Moderately Hard	reservoir
South Hill, Washington	46 mg/L	2.3 ppt	🟢 Soft	reservoir
Puyallup, Washington	89 mg/L	8.7 ppt	🟡 Moderately Hard	reservoir
Auburn, Washington	≈ 120–179 mg/L	8 ppt	🟠 Hard	groundwater

National Benchmark

How Bonney Lake compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Bonney Lake	≈ 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 Bonney Lake's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 62.5 mg/LpH: 7.3

The City of Bonney Lake Public Works Department manages the municipal water supply for Bonney Lake, located in Pierce County, Washington, serving approximately 15,000 residents within the city limits and surrounding areas. The utility sources water from the Carbon River or Puyallup River watershed, draining the slopes of Mount Rainier and the broader Cascade Range. No specific treatment plant names or named reservoirs were identified from available sources; published reports do not detail precise source designations for this system.

The regional geology of Pierce County features Tertiary basalt and andesite volcanic formations from the Cascade Range, combined with extensive glacial outwash deposits from Mount Rainier. This volcanic and glacial drainage produces very soft water with very low total dissolved solids, as the basaltic and andesitic rocks contribute minimal calcium and magnesium compared to carbonate-dominated terrains. Glacial outwash sands and gravels further dilute mineral content, resulting in a characteristically soft supply.

Very soft water means minimal scale buildup in water heaters, dishwashers, and coffee makers, supporting good appliance longevity with routine maintenance. Soap lathers efficiently and cleaning performance is generally high. A water softener is not warranted. However, Bonney Lake's supply has 2–3 contaminants above EPA health-based guidelines (MCLGs), though within legal limits; a certified filter is recommended especially for vulnerable populations. The water meets EPA safety standards with an overall compliance rating of 'B', indicating it satisfies legal requirements.

Geology & Source: Carbon River/Puyallup River watersheds — Mount Rainier Cascades Tertiary basalt and andesite; glacial outwash from Mount Rainier — volcanic and glacial drainage yields very soft water with very low TDS

Other Washington Water Reports

Prairie Ridge

74.5 mg/L

🟡 Moderately Hard

South Hill

46 mg/L

🟢 Soft

Puyallup

89 mg/L

🟡 Moderately Hard

Auburn

≈ 120–179 mg/L

🟠 Hard

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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 Bonney Lake's water safe to drink?

Yes. Bonney Lake'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 Bonney Lake?

At ≈ 120–179 mg/L (Hard), Bonney Lake'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 Bonney Lake compare to the USA average?

The USA national average is 151 mg/L. Bonney Lake (≈ 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 Bonney Lake 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.