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Town of Fairfield

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
643 people
Connections
282
Water source
Groundwater
Based in
Tekoa, WA
County
Spokane
Owner
Local government
Hardness
Varies by source
The ZIP code it serves

99012

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

Nitrate, total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), arsenic and chromium (total): Washington’s own results, samples taken from June 10, 2020 to Dec. 18, 2025, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits4

Nitrate

Comes from the source

Below EPA’s limits

5.5ppm

Highest sample; found in 18 of 21

2025 average: 4.0 ppm

The highest sample, in 2020, was 5.5 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its five samples averaged 4.0 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 4.9 ppm, in 2016.

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

15.5ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 15.5 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 19.1 ppb, in 2019.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.38ppm

Highest yearly average, 2025

Averaged by year, the highest was 0.38 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.48 ppm, in 2016.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

1.4ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 1.4 ppb, in 2024, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 6.6 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

Moderately hard to hard depending on the source, 102 to 122 mg/L (6 to 7.1 grains per gallon), across 2 sampling points, in 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 65 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, total trihalomethanes (TTHM), fluoride, 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. Town of Fairfield’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 June 10, 2020 to Dec. 18, 2025.

Testing your own tap

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

  • Eurofins Spokane

    Spokane Valley, WA · about 17 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (509) 924-9200

  • Tshimakain Creek Laboratories

    Spokane Valley, WA · about 20 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (509) 928-3577

  • Anatek Labs, Inc - Spokane

    Spokane, WA · about 21 miles

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

    (509) 838-3999

All 84 certified labs for Washington

Sources

PWSID WA5324450. Rebuilt from EPA data on Oct. 18, 2026.

Also in Spokane County

All Washington utilities

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