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Calico Lake Homeowners

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
150 people
Connections
56
Water source
Groundwater
Based in
Hesperia, CA
County
San Bernardino
Owner
Private
Hardness
Hard
The ZIP code it serves

92398

The short answer

1 result is above the health goal. The worst: Uranium, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Uranium, fluoride, nitrate, arsenic, chromium (total) and total trihalomethanes (TTHM): California’s own results, samples taken from June 4, 2020 to May 13, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Uranium

Comes from the source

Above the health goal

26.1ppb

Highest yearly average, 2020 to 2026

2026 average: 24.6 ppb

Averaged by year, the highest was 26.1 ppb, in 2021: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 28.3 ppb. In 2026, the latest year on file, its two samples averaged 24.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 27.2 ppb, in 2013.

What handles it

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.44ppm

Highest yearly average, 2022 to 2025

2025, one sample: 0.4 ppm

Averaged by year, the highest was 0.44 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.7 ppm, in 2013.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.67ppm

Highest sample; found in 1 of 11

2026: not found

The highest sample, in 2022, was 0.67 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 3.8 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Lead
  • Total trihalomethanes (TTHM)

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?

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

None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.

Compare five-year costs

Hardness

Hard, 140 mg/L (8.2 grains per gallon), at its one sampling point, 2019 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 8.2 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. 4 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Uranium, fluoride, nitrate, arsenic, chromium (total) and total trihalomethanes (TTHM) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Calico Lake Homeowners’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 June 4, 2020 to May 13, 2026.

Testing your own tap

Calico Lake Homeowners’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 Calico Lake Homeowners serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Geo-Monitor, Inc

    Hesperia, CA · about 40 miles

    Certified for bacteria

    (760) 244-3481

  • BSK Associates - San Bernardino Analytical Laboratory

    San Bernardino, CA · about 64 miles

    Certified for bacteria

    (559) 497-2888

  • Clinical Laboratory of San Bernardino, Inc.

    Grand Terrace, CA · about 66 miles

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

    (909) 825-7693

All 145 certified labs for California

Sources

PWSID CA3601036. Rebuilt from EPA data on Oct. 18, 2026.

Also in San Bernardino County

All California utilities

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