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City of Westmorland

What EPA’s and California’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
2,202 people
Connections
608
Water source
Surface water bought from another system
Based in
Westmorland, CA
County
Imperial
Owner
Local government
Hardness
Very hard
The ZIP code it serves

92281

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Total trihalomethanes (TTHM), above the legal limit. 5 health-based violations since 2016.

What handles it

What was found

Total trihalomethanes (TTHM), arsenic, chromium (total), haloacetic acids (HAA5), fluoride and nitrate: California’s own results, samples taken from Feb. 5, 2020 to April 22, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the legal limit

66.3ppb

Highest yearly average, 2020 to 2026

2026 average: 34.8 ppb

Averaged by year, the highest was 66.3 ppb, in 2024, below EPA’s legal limit of 80 ppb. Its highest single sample was 130 ppb. In 2026, the latest year on file, its three samples averaged 34.8 ppb. EPA judges this limit at each sampling point, and recorded a violation for total trihalomethanes (TTHM) at this utility in 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 75.6 ppb, in 2017, and EPA recorded violations in 2012 and 2017.

What handles it

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

Above the health goal1

Arsenic

Comes from the source

Above the health goal

3.0ppb

Highest yearly average, 2020 to 2026

2026, one sample: 2.2 ppb

Averaged by year, the highest was 3.0 ppb, in 2023: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2026, the latest year on file, its one sample was 2.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.9 ppb, in 2019.

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

Chromium (total)

Comes from the source

Below EPA’s limits

85ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 85 ppb, in 2023, below EPA’s legal limit of 100 ppb. Its highest single sample was 170 ppb. In 2026, the latest year on file, it wasn’t found in its one sample. EPA recorded no violation for chromium (total) at this utility since 2020.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

30.4ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 30.4 ppb, in 2026, below EPA’s legal limit of 60 ppb. Its highest single sample was 37 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 43.6 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.48ppm

Highest yearly average, 2020 to 2026

2026, one sample: 0.32 ppm

Averaged by year, the highest was 0.48 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 0.32 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.4 ppm, in 2019.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Lead
  • Nitrate

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: Trihalomethanes (TTHM) Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Total trihalomethanes (TTHM), Arsenic

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

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Total trihalomethanes (TTHM), Arsenic

    Other certifiers’ wording: 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

Hardness

Very hard, 340 mg/L (19.9 grains per gallon), at its one sampling point, 2019 to 2021.

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 19.9 grains per gallon, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Unaddressed
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2023 to Dec. 31, 20230.082 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2017 to Sept. 30, 20170.082 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2017 to June 30, 20170.087 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2017 to March 31, 20170.083 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), arsenic, chromium (total), haloacetic acids (HAA5), fluoride and nitrate results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. City of Westmorland’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; California’s results run from Feb. 5, 2020 to April 22, 2026.

Testing your own tap

City of Westmorland’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 California certifies.

The 3 labs California certifies closest to the area City of Westmorland serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Brawley Analytical, Inc.

    Brawley, CA · about 7 miles

    Certified for bacteria, minerals and other inorganics

    (760) 623-1556

  • Imperial County Public Health Laboratory

    El Centro, CA · about 18 miles

    Certified for bacteria

    (442) 265-1427

  • Babcock Laboratories, Inc.

    El Centro, CA · about 19 miles

    Certified for bacteria

    (951) 653-3351

All 145 certified labs for California

Sources

PWSID CA1310008. Rebuilt from EPA data on Oct. 18, 2026.

Also in Imperial County

All California utilities

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