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Chiriaco Summit Water Dist.

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
544 people
Connections
40
Water source
Surface water bought from another system
Based in
Chiriaco Summit, CA
County
Riverside
Owner
Private
The ZIP code it serves

92239

The short answer

1 result is above the health goal. The worst: Lead, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2013 to 2026.

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): California’s own results, samples taken from Aug. 3, 2020 to Nov. 3, 2025, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

0.7ppb

90th percentile, 2024 to 2026

In the latest period, 9 in 10 homes sampled were at or below 0.7 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

73ppb

Highest yearly average, 2020 to 2025

2025 average: 56.8 ppb

Averaged by year, the highest was 73 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 93 ppb. In 2025, the latest year on file, its four samples averaged 56.8 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 77 ppb, in 2019.

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

21ppb

Highest yearly average, 2020 to 2025

2025 average: 19.5 ppb

Averaged by year, the highest was 21 ppb, in 2021, below EPA’s legal limit of 60 ppb. Its highest single sample was 27 ppb. In 2025, the latest year on file, its four samples averaged 19.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 30 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

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.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. 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 water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 2 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Chiriaco Summit Water Dist.’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 Aug. 3, 2020 to Nov. 3, 2025.

Testing your own tap

Chiriaco Summit Water Dist.’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 Chiriaco Summit Water Dist. 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 54 miles

    Certified for bacteria, minerals and other inorganics

    (760) 623-1556

  • Imperial County Public Health Laboratory

    El Centro, CA · about 67 miles

    Certified for bacteria

    (442) 265-1427

  • Babcock Laboratories, Inc.

    El Centro, CA · about 68 miles

    Certified for bacteria

    (951) 653-3351

All 145 certified labs for California

Sources

PWSID CA3301115. Rebuilt from EPA data on Oct. 18, 2026.

Also in Riverside County

All California utilities

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