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City of Roy

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
1,214 people
Connections
325
Water source
Groundwater
Based in
Roy, WA
County
Pierce
Owner
Local government
The ZIP code it serves

98580

The short answer

1 result is above the health goal. The worst: Lead, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2005 to 2023.

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.4 ppm, for the period ending June 30, 1996. None since is on file, so it is not counted as a current finding.

Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Washington’s own results, samples taken from June 4, 2020 to Aug. 19, 2026, with EPA’s 2012 to 2019 file for earlier years.

Arsenic, chromium (total) and fluoride: EPA’s compliance monitoring file, samples taken from June 7, 2019 to June 7, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

2.0ppb

90th percentile, 2021 to 2023

In the latest period, 9 in 10 homes sampled were at or below 2.0 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 limits3

Nitrate

Comes from the source

Below EPA’s limits

2.5ppm

Highest sample; found in 8 of 13

2026, one sample: 1.5 ppm

The highest sample, in 2024, was 2.5 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 1.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 3.3 ppm, in 2015.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

17.9ppb

Highest yearly average, 2020 to 2025

2025, one sample: 12 ppb

Averaged by year, the highest was 17.9 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its one sample was 12 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 17.3 ppb, in 2019.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

7.5ppb

Highest yearly average, 2020 to 2025

Averaged by year, the highest was 7.5 ppb, in 2025, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 5.3 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

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

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.”

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

No health-based violations on file with EPA since 2016. There are 2 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Arsenic, chromium (total) and fluoride come from EPA’s file alone, which ends in 2019. City of Roy’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 June 4, 2020 to Aug. 19, 2026; EPA’s compliance samples are from June 7, 2019 to June 7, 2019.

Testing your own tap

City of Roy’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 City of Roy serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Water Management Laboratories, Inc.

    Tacoma, WA · about 15 miles

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

    (253) 531-3121

  • Thurston County Health Department Laboratory

    Olympia, WA · about 18 miles

    Certified for bacteria, nitrate

    (360) 867-2631

  • Olympic Analytical LLC dba Vanguard Laboratory

    Olympia, WA · about 24 miles

    Certified for bacteria, nitrate

    (360) 967-7010

All 84 certified labs for Washington

Sources

PWSID WA5345027. Rebuilt from EPA data on Oct. 18, 2026.

Also in Pierce County

All Washington utilities

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