How does Lynnwood's water compare to the national average?

The USA national average is 151 mg/L. Lynnwood (12.4 mg/L) is 138 mg/L softer than average.

Lynnwood Water Hardness & Quality Report (2026)

Water Hardness

12.4mg/L

Soft

0.7 grains per gallon

Source

reservoir

pH Level

7.7

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

175.2 mg/L

Est. Daily Cost

$0.03

energy & soap waste

Source: See methodology section below · Updated 2026

12.4mg/L as CaCO₃Soft

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 Lynnwood, your appliances are currently losing 2% efficiency due to mineral buildup.

Appliance	In Lynnwood	Soft Water City	Efficiency Loss
Kettle	9.2 yrs	8.5 yrs	—
Washing Machine	13.1 yrs	12 yrs	—
Water Heater	15.1 yrs	15 yrs	—

Regional Water Comparison

How Lynnwood compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Lynnwood, Washington	12.4 mg/L	0 ppt	🟢 Soft	reservoir
Mountlake Terrace, Washington	58.5 mg/L	0 ppt	🟢 Soft	reservoir
Picnic Point-North Lynnwood, Washington	≈ 120–179 mg/L	2.7 ppt	🟠 Hard	reservoir
Edmonds, Washington	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
Shoreline, Washington	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir

National Benchmark

How Lynnwood compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Lynnwood	12.4 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Lynnwood's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 175.2 mg/LpH: 7.7

The City of Lynnwood, Washington, operates a municipal water utility serving approximately 63,204 people in Snohomish County. The system draws from both groundwater and surface sources within the Snohomish River watershed, with treatment and distribution managed by the Public Works Department (19100 44th Ave W, Lynnwood, WA 98036). The utility employs standard treatment including filtration and pH adjustment, reporting zero MCL violations and full compliance with EPA standards as of 2024.

Lynnwood's water originates from the Puget Sound lowland aquifer system and surface reservoirs fed by the Snohomish River drainage. The underlying geology consists of Quaternary glacial deposits — sand, gravel, and clay — underlain by Tertiary-age sandstone and siltstone bedrock. This glacial landscape, shaped by Pleistocene ice sheets, produces a soft water supply, with dissolved calcium and magnesium levels reflecting limited mineral leaching from glacial till and weathered bedrock. Total hardness measures 12.4 ppm as CaCO₃ equivalent.

At 12.4 mg/L, Lynnwood's water is soft, meaning residents experience minimal scale buildup on fixtures and appliances. Water heaters, dishwashers, and washing machines are unlikely to suffer significant mineral accumulation over time. A water softener is not required; regular appliance maintenance is sufficient. Lynnwood's 2025 Consumer Confidence Report confirms zero MCL violations and 100% compliance with EPA turbidity limits (0.3 NTU), with finished water pH averaging 8.0 (range 7.6–9.1) to support corrosion control and lead/copper compliance.

Geology & Source: Puget Sound lowland aquifer system and Snohomish River watershed; Quaternary glacial sand, gravel, and clay over Tertiary sandstone and siltstone; limited mineral dissolution from glacial deposits — soft supply at 12.4 mg/L

Other Washington Water Reports

Mountlake Terrace

58.5 mg/L

🟢 Soft

Picnic Point-North Lynnwood

≈ 120–179 mg/L

🟠 Hard

Edmonds

≈ 0–60 mg/L

🟢 Soft

Shoreline

≈ 0–60 mg/L

🟢 Soft

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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 Lynnwood's water safe to drink?

Yes. Lynnwood's water meets all federal safety standards. The hardness is 12.4 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Lynnwood?

Lynnwood's water is soft at 12.4 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Lynnwood compare to the USA average?

The USA national average is 151 mg/L. Lynnwood (12.4 mg/L) is 138 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 Lynnwood 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.