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Monse - Riggan Camp

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
1,165 people
Connections
8
Water source
Groundwater
Based in
Brewster, WA
County
Okanogan
Owner
Private

The short answer

1 result is above EPA’s legal limit. The worst: Nitrate, above the legal limit. 1 health-based violation since 2016.

What handles it

What was found

Nitrate: Washington’s own results, samples taken from March 25, 2020 to March 18, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Nitrate

Comes from the source

Above the legal limit

13.8ppm

Highest sample; found in 8 of 8

2026, one sample: 0.47 ppm

In 2022, two samples were above EPA’s legal limit of 10 ppm, the highest 13.8 ppm. The next sample at the same point, within 30 days, kept the average above the limit for one; one has no follow-up sample on file within 30 days. In 2026, the latest year on file, its one sample was 0.47 ppm. EPA recorded a violation for nitrate at this utility in 2022. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 9.2 ppm, in 2013.

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.
  • Lead

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

    Claim: Nitrate/Nitrite (30 ppm challenge)

    For: Nitrate

  • NSF/ANSI 58

    Claim: Nitrate/Nitrite Reduction

    For: Nitrate

    Other certifiers’ wording: Nitrate

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
NitrateA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJan. 1, 2022 to Dec. 31, 202213.8 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 49 monitoring or reporting violations not shown.

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. Monse - Riggan Camp’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 March 25, 2020 to March 18, 2026.

Testing your own tap

Monse - Riggan Camp’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.

No lab Washington certifies is within 75 miles of the area Monse - Riggan Camp serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 84 certified labs for Washington

Sources

PWSID WA53AC141. Rebuilt from EPA data on Oct. 18, 2026.

Also in Okanogan County

All Washington utilities

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