Washtucna Water Department

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: 250 people
Connections: 150
Water source: Groundwater
Based in: Washtucna, WA
County: Adams
Owner: Local government
Hardness: Soft

The ZIP code it serves

99371

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

Fluoride, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic and chromium (total): Washington’s own results, samples taken from Aug. 7, 2020 to June 23, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

2.3ppm

Highest yearly average, 2024 to 2026

2026, one sample: 1.6 ppm

Averaged by year, the highest was 2.3 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 1.6 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.77 ppm, in 2019.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Nitrate

Comes from the source

Below EPA’s limits

2.5ppm

Highest sample; found in 5 of 15

2026: not found

The highest sample, in 2024, was 2.5 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 10 ppm, in 2014.

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

13.4ppb

Highest yearly average, 2022 to 2026

2026 average: 7.3 ppb

Averaged by year, the highest was 13.4 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its two samples averaged 7.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14.3 ppb, in 2012.

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

2.0ppb

Highest yearly average, 2022 to 2026

2026 average: 1.9 ppb

Averaged by year, the highest was 2.0 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 2.6 ppb. In 2026, the latest year on file, its two samples averaged 1.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.8 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)
Lead

Hardness

Soft, 17 mg/L (1 grain per gallon), at its one sampling point, in 2024.

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 at 1 grains per gallon, salt included Softener 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 21 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

Everything else. Fluoride, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic and chromium (total) results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Washtucna Water Department’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 Aug. 7, 2020 to June 23, 2026.

Testing your own tap

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

AV Labs, Inc
Othello, WA · about 41 miles
Certified for bacteria
(509) 488-2468
Matrix Sciences International Inc. dba KTL
Pasco, WA · about 42 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics
(509) 547-3838
RJ Lee Group, Inc. Columbia Basin Analytical Laboratories
Pasco, WA · about 42 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics
(509) 792-1951