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

The USA national average is 151 mg/L. Mukilteo (≈ 0–59 mg/L) is 121 mg/L softer than average.

Mukilteo Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.6

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

144.7 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · 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 Mukilteo, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Mukilteo	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Mukilteo compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Mukilteo, Washington	≈ 0–59 mg/L	0 ppt	🟢 Soft	reservoir
Picnic Point-North Lynnwood, Washington	≈ 120–179 mg/L	2.7 ppt	🟠 Hard	reservoir
Everett, Washington	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
Martha Lake, Washington	≈ 0–60 mg/L	1.3 ppt	🟢 Soft	reservoir
Lynnwood, Washington	12.4 mg/L	0 ppt	🟢 Soft	reservoir

National Benchmark

How Mukilteo compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Mukilteo	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Mukilteo's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 144.7 mg/LpH: 7.6

Mukilteo Water & Wastewater District serves the city of Mukilteo in Snohomish County, Washington, providing drinking water to approximately 21,000 residents along the Puget Sound shoreline. The utility purchases surface water and treats it via conventional methods including softening and disinfection with hypochlorite at main treatment operations at 7824 Mukilteo Speedway. Annual water quality reports are published detailing compliance and monitoring results.

Water originates from protected Puget Sound watersheds, primarily influenced by the Snohomish River basin draining the Cascade foothills. Surficial geology is dominated by glacial till and outwash from the Fraser Glaciation, underlain by Eocene-Miocene arkosic sandstones and shales of the Puget Group. This non-carbonate geology, combined with granitic and volcanic Cascade Range terrain upstream, provides precipitation-fed flows with very limited ion exchange, yielding a very soft, low-dissolved-solids supply typical of Pacific Northwest surface water.

Very soft water minimizes scale buildup in pipes, heaters, and appliances, reducing energy losses and extending lifespan without frequent deliming. Kettles, dishwashers, and laundry machines experience little residue. No water softener is needed or recommended; maintenance should focus on corrosion prevention, favoring pH-balanced plumbing materials in low-alkalinity supply conditions. The 2021 Consumer Confidence Report confirms full EPA compliance; treatment includes coagulation, filtration, softening, and chlorination. No PFAS or lead exceedances are reported; pH is typically stable around 7–8.

Geology & Source: Puget Sound region; Quaternary glacial till and outwash over Eocene-Miocene Puget Group sandstones and siltstones; non-carbonate geology with Cascade granitic and volcanic influences; very soft water

Other Washington Water Reports

Picnic Point-North Lynnwood

≈ 120–179 mg/L

🟠 Hard

Everett

≈ 0–60 mg/L

🟢 Soft

Martha Lake

≈ 0–60 mg/L

🟢 Soft

Lynnwood

12.4 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 Mukilteo's water safe to drink?

Yes. Mukilteo's water meets all federal safety standards. The hardness is ≈ 0–59 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 Mukilteo?

Mukilteo's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Mukilteo compare to the USA average?

The USA national average is 151 mg/L. Mukilteo (≈ 0–59 mg/L) is 121 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 Mukilteo 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.