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Norcliffe Water Association

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
57 people
Connections
23
Water source
Groundwater
Based in
Coupeville, WA
County
Island
Owner
Private
The ZIP code it serves

98277

The short answer

3 results are above EPA’s legal limit, and 1 more is above the health goal. The worst: Total trihalomethanes (TTHM), above the legal limit. 2 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2006 to 2020.

Total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate: Washington’s own results, samples taken from Sept. 21, 2020 to Sept. 8, 2026, with EPA’s 2012 to 2019 file for earlier years.

Fluoride, arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from Dec. 27, 2016 to Oct. 23, 2017. Newer results are in the utility’s annual water quality report.

Above the legal limit3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the legal limit

295ppb

Highest yearly average, 2022 to 2026

Averaged by year, the highest was 295 ppb, in 2026, about 3.7 times EPA’s legal limit of 80 ppb. Its highest single sample was 430 ppb. That was also the latest year on file. EPA recorded a violation for total trihalomethanes (TTHM) at this utility in 2026. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 197 ppb, in 2016.

What handles it

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

Copper

Comes from pipes, often your own

Above the action level

4.4ppm

90th percentile, 2018 to 2020

In the latest period, 9 in 10 homes sampled were at or below 4.4 ppm, above EPA’s action level of 1.3 ppm.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the legal limit

128ppb

Highest yearly average, 2022 to 2026

2026 average: 124 ppb

Averaged by year, the highest was 128 ppb, in 2025, about twice EPA’s legal limit of 60 ppb. Its highest single sample was 144 ppb. In 2026, the latest year on file, its two samples averaged 124 ppb, above the limit. EPA recorded a violation for haloacetic acids (HAA5) at this utility in 2026. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 25.6 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

3.6ppb

90th percentile, 2017

In the latest period, 9 in 10 homes sampled were at or below 3.6 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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.9ppm

Highest yearly average, 2016 to 2017

2017: not found

Averaged by year, the highest was 0.9 ppm, in 2016, below EPA’s legal limit of 4.0 ppm. In 2017, the latest year on file, it wasn’t found in its one sample.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.17ppm

Highest sample; found in 2 of 7

2026: not found

The highest sample, in 2024, was 0.17 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)

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: Trihalomethanes (TTHM) Reduction, Copper Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), Copper, Lead

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Copper Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), Copper, Lead

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 water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2026 to June 30, 2026121 UG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2026 to June 30, 2026162 UG/LArchived
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 25 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic and chromium (total) come from EPA’s file alone, which ends in 2019. Norcliffe Water Association’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 Sept. 21, 2020 to Sept. 8, 2026; EPA’s compliance samples are from Dec. 27, 2016 to Oct. 23, 2017.

Testing your own tap

Norcliffe Water Association’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 Norcliffe Water Association serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Eurofins DW and WW West, Washington Laboratory

    Burlington, WA · about 18 miles

    Certified for bacteria, nitrate, minerals and other inorganics, disinfection byproducts

    (360) 757-1400

  • Precision Analytical Laboratories, LLC

    Everett, WA · about 29 miles

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

    (425) 740-4597

  • Everett Environmental Laboratory

    Everett, WA · about 31 miles

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

    (425) 257-8230

All 84 certified labs for Washington

Sources

PWSID WA5384566. Rebuilt from EPA data on Oct. 18, 2026.

Also in Island County

All Washington utilities

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