How does North Creek's water compare to the national average?

The USA national average is 151 mg/L. North Creek (≈ 60–119 mg/L) is 61 mg/L softer than average.

North Creek Water Hardness & Quality Report (2026)

Water Hardness

moderately hard

~60–119 mg/L

Moderately Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.7

neutral = 7.0

Lead

0.009 mg/L

✓ Below action level

TDS

209.6 mg/L

Est. Daily Cost

$0.24

energy & soap waste

Source: See methodology section below · Updated 2026

moderately hard~60–119 mg/LModerately Hard · 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 North Creek, your appliances are currently losing 12% efficiency due to mineral buildup.

Appliance	In North Creek	Soft Water City	Efficiency Loss
Kettle	7.5 yrs	8.5 yrs	-12%
Washing Machine	10.6 yrs	12 yrs	-12%
Water Heater	13.2 yrs	15 yrs	-12%

Regional Water Comparison

How North Creek compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ North Creek, Washington	≈ 60–119 mg/L	3.3 ppt	🟡 Moderately Hard	reservoir
Mill Creek East, Washington	≈ 0–60 mg/L	2 ppt	🟢 Soft	reservoir
Mill Creek, Washington	≈ 120–179 mg/L	2.1 ppt	🟠 Hard	reservoir
Silver Firs, Washington	≈ 0–60 mg/L	2 ppt	🟢 Soft	reservoir
Bothell, Washington	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir

National Benchmark

How North Creek compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ North Creek	≈ 60–119 mg/L	🟡 Low
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes North Creek's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 209.6 mg/LpH: 7.7

No official municipal water utility data for North Creek, Washington could be confirmed. North Creek is an unincorporated community in King County and does not operate as an independent municipal water utility with published Consumer Confidence Reports. The area is likely served by a regional utility such as Seattle Public Utilities, a King County water district, or the Alderwood Water District drawing from Spada Lake in the Snohomish watershed, or by individual private wells.

The broader North Creek corridor sits within Snohomish County's Cascades watershed, characterised by Quaternary volcanic geology that is calcareous-poor. The Spada Lake reservoir source in the Snohomish watershed drains terrain with limited limestone or carbonate bedrock, resulting in a moderately soft supply typical of the north Seattle suburban region. Effective treatment at regional facilities manages water quality before distribution.

Soft to moderately soft water minimises scale buildup in appliances and fixtures, extending equipment lifespan without limescale interference. No softening equipment is generally needed. Residents should contact the King County Health Department or their specific water service provider to confirm the serving utility, obtain Consumer Confidence Reports, and verify current water quality parameters including hardness, disinfection residuals, and any contaminant detections.

Geology & Source: Snohomish County Cascades watershed — Quaternary calcareous-poor volcanic geology; Spada Lake reservoir source via Alderwood Water District; low carbonate content yields moderately soft supply

Other Washington Water Reports

Mill Creek East

≈ 0–60 mg/L

🟢 Soft

Mill Creek

≈ 120–179 mg/L

🟠 Hard

Silver Firs

≈ 0–60 mg/L

🟢 Soft

Bothell

≈ 0–60 mg/L

🟢 Soft

Report an Issue

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 North Creek's water safe to drink?

Yes. North Creek's water meets all federal safety standards. The hardness is ≈ 60–119 mg/L (Moderately Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in North Creek?

North Creek's water is moderately hard at ≈ 60–119 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does North Creek compare to the USA average?

The USA national average is 151 mg/L. North Creek (≈ 60–119 mg/L) is 61 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 North Creek 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.