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North Forty Property Owners Assn

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
27 people
Connections
22
Water source
Groundwater
Based in
Friday Harbor, WA
County
San Juan
Owner
Private
Hardness
Varies by source
The ZIP code it serves

98250

The short answer

1 result is above the limit’s level with no violation recorded, and 1 more is above the health goal. The worst: Total trihalomethanes (TTHM), above the limit’s level, no violation. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2004 to 2025.

Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate and arsenic: Washington’s own results, samples taken from July 7, 2020 to Aug. 31, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the limit’s level, no violation

81ppb

Highest yearly average, 2023 to 2024

2024, one sample: 34.2 ppb

Averaged by year, the highest was 81 ppb, in 2023, above EPA’s legal limit of 80 ppb. Its highest single sample was 158 ppb. In 2024, the latest year on file, its one sample was 34.2 ppb. EPA judges this limit on running averages at each sampling point, and recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 13.9 ppb, in 2016.

What handles it

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

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

0.3ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 0.3 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 limits4

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

24.4ppb

Highest yearly average, 2023 to 2024

2024, one sample: 3.2 ppb

Averaged by year, the highest was 24.4 ppb, in 2023, below EPA’s legal limit of 60 ppb. Its highest single sample was 66.1 ppb. In 2024, the latest year on file, its one sample was 3.2 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.17ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 0.17 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.16 ppm, in 2018.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

3.4ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 3.4 ppb, in 2025, below EPA’s legal limit of 100 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.0 ppb, in 2012.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.18ppm

Highest sample; found in 3 of 16

2026: not found

The highest sample, in 2025, was 0.18 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.14 ppm, in 2016.

What handles it

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

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, Lead Reduction

    For: Total trihalomethanes (TTHM), Lead

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), 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

Hardness

Soft to moderately hard depending on the source, 50 to 91 mg/L (2.9 to 5.3 grains per gallon), across 2 sampling points, 2022 to 2025.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared, salt includedSoftener or salt-free conditioner?Washington water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate and arsenic results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. North Forty Property Owners Assn’s own annual report, which it must send you every year, has 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 July 7, 2020 to Aug. 31, 2026.

Testing your own tap

North Forty Property Owners Assn’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 North Forty Property Owners Assn serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Exact Scientific Services, Inc.

    Ferndale, WA · about 30 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts

    (360) 733-1205

  • Eurofins DW and WW West, Washington Laboratory

    Burlington, WA · about 35 miles

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

    (360) 757-1400

  • Clallam County Environmental Laboratory

    Port Angeles, WA · about 46 miles

    Certified for bacteria, nitrate

    (360) 417-2334

All 84 certified labs for Washington

Sources

PWSID WA5301698. Rebuilt from EPA data on Oct. 18, 2026.

Also in San Juan County

All Washington utilities

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