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Goss Lake Park Community

What EPA’s and Washington’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
285 people
Connections
149
Water source
Groundwater
Based in
Coupeville, WA
County
Island
Owner
Private
The ZIP code it serves

98260

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Arsenic, above the legal limit. 3 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2002 to 2023.

Arsenic and nitrate: Washington’s own results, samples taken from Jan. 28, 2020 to Sept. 16, 2026, with EPA’s 2012 to 2019 file for earlier years.

Total trihalomethanes (TTHM), fluoride, chromium (total) and haloacetic acids (HAA5): EPA’s compliance monitoring file, samples taken from Aug. 27, 2014 to Sept. 27, 2017. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Arsenic

Comes from the source

Above the legal limit

8.2ppb

Highest yearly average, 2020 to 2026

2026 average: 4.8 ppb

Averaged by year, the highest was 8.2 ppb, in 2024: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 28.9 ppb. In 2026, the latest year on file, its four samples averaged 4.8 ppb. EPA judges this limit at each sampling point, and recorded a violation for arsenic at this utility in 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 6.4 ppb, in 2016.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

4.8ppb

90th percentile, 2021 to 2023

In the latest period, 9 in 10 homes sampled were at or below 4.8 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

14ppb

Highest yearly average, 2015

Averaged by year, the highest was 14 ppb, in 2015, below EPA’s legal limit of 80 ppb. That is the only year on file.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.35ppm

Highest yearly average, 2016

Averaged by year, the highest was 0.35 ppm, in 2016, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Nitrate

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Arsenic, Lead

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
ArsenicA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJuly 1, 2020 to Sept. 30, 20200.011 MG/LResolved
ArsenicA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleApril 1, 2020 to June 30, 20200.011 MG/LResolved
ArsenicA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJan. 1, 2020 to March 31, 20200.011 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 3 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic and nitrate results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Total trihalomethanes (TTHM), fluoride, chromium (total) and haloacetic acids (HAA5) come from EPA’s file alone, which ends in 2019. Goss Lake Park Community’s own annual report, which it must send you every year, has newer results for those and the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Washington’s results run from Jan. 28, 2020 to Sept. 16, 2026; EPA’s compliance samples are from Aug. 27, 2014 to Sept. 27, 2017.

Testing your own tap

Goss Lake Park Community’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Washington certifies.

The 3 labs Washington certifies closest to the area Goss Lake Park Community serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Precision Analytical Laboratories, LLC

    Everett, WA · about 11 miles

    Certified for lead and copper, metals, minerals and other inorganics

    (425) 740-4597

  • Everett Environmental Laboratory

    Everett, WA · about 14 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics

    (425) 257-8230

  • Spectra Laboratories - Kitsap, LLC

    Poulsbo, WA · about 21 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (360) 779-5141

All 84 certified labs for Washington

Sources

PWSID WA5328575. Rebuilt from EPA data on Oct. 18, 2026.

Also in Island County

All Washington utilities

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