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Riverhill Homeowners 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
215 people
Connections
86
Water source
Groundwater
Based in
Belfair, WA
County
Mason
Owner
Private
The ZIP code it serves

98528

The short answer

Nothing in EPA’s and Washington’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Lead and copper: lead at 2.0 mg/L (2007) is left out of this report: more than 20 times the action level, it looks like µg/L entered as mg/L.

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 8.5 ppm, for the period ending Dec. 31, 2007. None since is on file, so it is not counted as a current finding.

Nitrate: Washington’s own results, samples taken from Dec. 30, 2020 to Sept. 8, 2026, with EPA’s 2012 to 2019 file for earlier years.

Arsenic, chromium (total), fluoride and uranium: EPA’s compliance monitoring file, samples taken from Dec. 29, 2016 to Dec. 29, 2019. Newer results are in the utility’s annual water quality report.

None of the contaminants in the records below were found at or above the reporting levels.

6 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Fluoride
  • Lead
  • Nitrate
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016. There are 5 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Arsenic, chromium (total), fluoride and uranium come from EPA’s file alone, which ends in 2019. Riverhill Homeowners Assn’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 Dec. 30, 2020 to Sept. 8, 2026; EPA’s compliance samples are from Dec. 29, 2016 to Dec. 29, 2019.

Testing your own tap

Riverhill Homeowners 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 Riverhill Homeowners Assn serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Thurston County Health Department Laboratory

    Olympia, WA · about 23 miles

    Certified for bacteria, nitrate

    (360) 867-2631

  • Spectra Laboratories - Kitsap, LLC

    Poulsbo, WA · about 25 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (360) 779-5141

  • Olympic Analytical LLC dba Vanguard Laboratory

    Olympia, WA · about 26 miles

    Certified for bacteria, nitrate

    (360) 967-7010

All 84 certified labs for Washington

Sources

PWSID WA5372810. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Mason County

All Washington utilities

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