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Great Basin Water Burbank

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
656 people
Connections
212
Water source
Groundwater
Based in
Pasco, WA
County
Walla Walla
Owner
Private
The ZIP code it serves

99323

The short answer

2 results are above EPA’s legal limit, and 1 more is above the health goal. The worst: Nitrate, above the legal limit. 5 health-based violations since 2016.

What handles it

What was found

Nitrate, fluoride, total trihalomethanes (TTHM) and haloacetic acids (HAA5): Washington’s own results, samples taken from Jan. 22, 2020 to Sept. 29, 2026, with EPA’s 2012 to 2019 file for earlier years.

Arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from Dec. 19, 2017 to Oct. 16, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit2

Nitrate

Comes from the source

Above the legal limit

11.7ppm

Highest sample; found in 149 of 162

2026 average: 3.1 ppm

From 2020 to 2022, four samples were above EPA’s legal limit of 10 ppm, the highest 11.7 ppm in 2020. Two came back under the limit on the next sample at the same point and two have no follow-up sample on file within 30 days. In 2026, the latest year on file, its 10 samples averaged 3.1 ppm. EPA recorded violations for nitrate at this utility in 2020 and 2022. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 8.7 ppm, in 2015.

What handles it

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

Fluoride

Forms or is added in treatment

Above the legal limit

3.4ppm

Highest yearly average, 2020 to 2026

2026 average: 2.2 ppm

Averaged by year, the highest was 3.4 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 6.0 ppm. In 2026, the latest year on file, its six samples averaged 2.2 ppm. EPA judges this limit at each sampling point, and recorded a violation for fluoride at this utility in 2024. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.5 ppm, in 2018.

What handles it

Above the health goal1

Arsenic

Comes from the source

Above the health goal

4.5ppb

Highest yearly average, 2017 to 2018

2018: not found

Averaged by year, the highest was 4.5 ppb, in 2017: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2018, the latest year on file, it wasn’t found in its one sample.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

22.6ppb

Highest yearly average, 2021 to 2025

2025 average: 14.9 ppb

Averaged by year, the highest was 22.6 ppb, in 2021, below EPA’s legal limit of 80 ppb. Its highest single sample was 26 ppb. In 2025, the latest year on file, its two samples averaged 14.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 18.9 ppb, in 2013.

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

4.0ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 4.0 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 5.1 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.9 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Chromium (total)

Comes from the source

Below EPA’s limits

5.6ppb

Highest yearly average, 2017 to 2018

2018: not found

Averaged by year, the highest was 5.6 ppb, in 2017, below EPA’s legal limit of 100 ppb. In 2018, the latest year on file, it wasn’t found in its one sample.

What handles it

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

    Claims: Nitrate/Nitrite (30 ppm challenge), Fluoride, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Nitrate, Fluoride, Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Nitrate/Nitrite Reduction, Fluoride Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Nitrate, Fluoride, Arsenic

    Other certifiers’ wording: Nitrate; Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

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

The best water filters for fluoride, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
FluorideA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleApril 1, 2024 to June 30, 20244.3 MG/LResolved
FluorideA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJan. 1, 2024 to March 31, 20244.4 MG/LResolved
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, 202210.6 MG/LResolved
NitrateA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleApril 1, 2020 to June 30, 202011.7 MG/LResolved
NitrateA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleJan. 1, 2020 to Dec. 31, 202011.7 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 177 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, fluoride, 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 and chromium (total) come from EPA’s file alone, which ends in 2019. Great Basin Water Burbank’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 Jan. 22, 2020 to Sept. 29, 2026; EPA’s compliance samples are from Dec. 19, 2017 to Oct. 16, 2018.

Testing your own tap

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

  • Matrix Sciences International Inc. dba KTL

    Pasco, WA · about 14 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 14 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics

    (509) 792-1951

  • Benton-Franklin Health District Lab

    Kennewick, WA · about 15 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (509) 460-4206

All 84 certified labs for Washington

Sources

PWSID WA5331477. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Walla Walla County

All Washington utilities

What to do next