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Anza Mutual Water Company

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
224 people
Connections
85
Water source
Groundwater
Based in
Anza, CA
County
Riverside
Owner
Private
Hardness
Hard
The ZIP code it serves

92539

The short answer

2 results are above the health goal. The worst: Uranium, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Uranium, arsenic, nitrate, total trihalomethanes (TTHM), fluoride, chromium (total) and haloacetic acids (HAA5): California’s own results, samples taken from Feb. 3, 2020 to April 15, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Uranium

Comes from the source

Above the health goal

11.6ppb

Highest yearly average, 2025

Averaged by year, the highest was 11.6 ppb, in 2025: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10.9 ppb, in 2019.

What handles it

Arsenic

Comes from the source

Above the health goal

2.4ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 2.4 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2024, 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 limits5

Nitrate

Comes from the source

Below EPA’s limits

8.4ppm

Highest sample; found in 27 of 28

2026 average: 6.0 ppm

The highest sample, in 2020, was 8.4 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its three samples averaged 6.0 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 9.5 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

11.8ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 11.8 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 23.6 ppb. That was also the latest year on file.

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

0.35ppm

Highest yearly average, 2021 to 2025

2025, one sample: 0.31 ppm

Averaged by year, the highest was 0.35 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.31 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.42 ppm, in 2015.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

3.5ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 3.5 ppb, in 2021, below EPA’s legal limit of 100 ppb. In 2024, the latest year on file, it wasn’t found in its one sample.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

1.9ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 1.9 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 3.9 ppb. That was also the latest year on file.

What handles it

No certification claim covers this compound yet.

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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

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

  • NSF/ANSI 58

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

    For: Uranium, 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

Hard, 142 mg/L (8.3 grains per gallon), at its one sampling point, 2022 to 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 at 8.3 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
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 1 monitoring or reporting violation not shown.

What this report can’t tell you

  • Everything else. Uranium, arsenic, nitrate, total trihalomethanes (TTHM), fluoride, chromium (total) and haloacetic acids (HAA5) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Anza Mutual Water Company’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. 3, 2020 to April 15, 2026.

Testing your own tap

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

  • Applied Industrial Microbiology, Inc.

    Vista, CA · about 43 miles

    Certified for bacteria, nitrate

    (760) 295-0430

  • Alpha Analytical Laboratories, Inc. - San Diego

    Vista, CA · about 45 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (760) 536-3352

  • Babcock Laboratories, Inc.

    Riverside, CA · about 47 miles

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

    (951) 653-3351

All 145 certified labs for California

Sources

PWSID CA3301180. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Riverside County

All California utilities

What to do next