Skip to content
TapBuff
ZIP

Camp Loma Mar

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
25 people
Connections
21
Water source
Surface water
Based in
Oakland, CA
County
San Mateo
Owner
Private
Hardness
Very hard
The ZIP code it serves

94021

The short answer

2 results are above the limit’s level with no violation recorded, and 1 more is above the health goal. The worst: Total trihalomethanes (TTHM), above the limit’s level, no violation. 1 health-based violation since 2016.

What handles it

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, fluoride, chromium (total) and nitrate: California’s own results, samples taken from June 9, 2020 to March 19, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the limit’s level, no violation

284ppb

Highest yearly average, 2020 to 2026

2026, one sample: 125 ppb

Averaged by year, the highest was 284 ppb, in 2021, about 3.5 times EPA’s legal limit of 80 ppb. Its highest single sample was 415 ppb. In 2026, the latest year on file, its one sample was 125 ppb, above the limit. EPA judges this limit on running averages at each sampling point, and recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 186 ppb, in 2013, and EPA recorded a violation in 2012.

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

Above the limit’s level, no violation

95.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 88 ppb

Averaged by year, the highest was 95.5 ppb, in 2022, above EPA’s legal limit of 60 ppb. Its highest single sample was 154 ppb. In 2026, the latest year on file, its one sample was 88 ppb, above the limit. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 179 ppb, in 2013, and EPA recorded a violation in 2012.

What handles it

No certification claim covers this compound yet.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

1.9ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 1.9 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. 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 yearly average of 10 ppb, in 2018.

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 limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.3ppm

Highest yearly average, 2020 to 2026

2026, one sample: 0.2 ppm

Averaged by year, the highest was 0.3 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 0.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.32 ppm, in 2013.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

1.5ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 1.5 ppb, in 2020, below EPA’s legal limit of 100 ppb. 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 yearly average of 0.95 ppb, in 2013.

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, 233 mg/L (13.6 grains per gallon), at its one sampling point, 2019 to 2026.

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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Sept. 1, 2023 to Sept. 30, 2023—Resolved
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. Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, fluoride, chromium (total) and nitrate results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Camp Loma Mar’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 9, 2020 to March 19, 2026.

Testing your own tap

Camp Loma Mar’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 Camp Loma Mar serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • San Mateo County Public Health Laboratory

    San Mateo, CA · about 18 miles

    Certified for bacteria

    (650) 573-2500

  • Eurofins Built Environment Testing West-Burlingame

    Burlingame, CA · about 22 miles

    Certified for bacteria

    (623) 298-1015

  • Garratt-Callahan Laboratory

    Burlingame, CA · about 23 miles

    Certified for nitrate, metals, minerals and other inorganics

    (650) 697-5811

All 145 certified labs for California

Sources

PWSID CA4100529. Rebuilt from EPA data on Oct. 18, 2026.

Also in San Mateo County

All California utilities

What to do next