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Kinneloa Irrigation 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
1,808 people
Connections
551
Water source
Groundwater
Based in
Pasadena, CA
County
Los Angeles
Owner
Local government
Hardness
Varies by source
The ZIP code it serves

91107

The short answer

2 results are above the health goal. The worst: Uranium, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Uranium, arsenic, nitrate, fluoride, total trihalomethanes (TTHM), haloacetic acids (HAA5) and chromium (total): California’s own results, samples taken from Jan. 7, 2020 to April 21, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Uranium

Comes from the source

Above the health goal

15.8ppb

Highest yearly average, 2021 to 2025

2025, one sample: 3.7 ppb

Averaged by year, the highest was 15.8 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 22.4 ppb. In 2025, the latest year on file, its one sample was 3.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 15.1 ppb, in 2018.

What handles it

Arsenic

Comes from the source

Above the health goal

2.9ppb

Highest yearly average, 2021 to 2025

2025 average: 1.5 ppb

Averaged by year, the highest was 2.9 ppb, in 2024: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 8.0 ppb. In 2025, the latest year on file, its five samples averaged 1.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.3 ppb, in 2016.

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 limits4

Nitrate

Comes from the source

Below EPA’s limits

6.0ppm

Highest sample; found in 82 of 82

2026 average: 4.3 ppm

The highest sample, in 2026, was 6.0 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its six samples averaged 4.3 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.0 ppm, in 2016.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

2.2ppm

Highest yearly average, 2020 to 2026

2026 average: 1.4 ppm

Averaged by year, the highest was 2.2 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 3.7 ppm. In 2026, the latest year on file, its 20 samples averaged 1.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.9 ppm, in 2012.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

11.7ppb

Highest yearly average, 2020 to 2026

2026 average: 7.5 ppb

Averaged by year, the highest was 11.7 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 57 ppb. In 2026, the latest year on file, its 19 samples averaged 7.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 16.4 ppb, in 2015.

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

4.3ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 4.3 ppb, in 2020, below EPA’s legal limit of 60 ppb. Its highest single sample was 5.2 ppb. In 2025, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 6.0 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • 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

Moderately hard to very hard depending on the source, 102 to 296 mg/L (6 to 17.3 grains per gallon), across 7 sampling points, 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, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There are 4 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Uranium, arsenic, nitrate, fluoride, total trihalomethanes (TTHM), haloacetic acids (HAA5) and chromium (total) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Kinneloa Irrigation 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 Jan. 7, 2020 to April 21, 2026.

Testing your own tap

Kinneloa Irrigation 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 Kinneloa Irrigation Dist. serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • EMSL Analytical, Inc. (LA Testing)

    South Pasadena, CA · about 5 miles

    Certified for bacteria, asbestos

    (323) 254-9960

  • Weck Laboratories, Inc.

    City of Industry, CA · about 11 miles

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

    (626) 336-2139

  • Michelson Laboratories, Inc.

    Commerce, CA · about 13 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics

    (562) 928-0553

All 145 certified labs for California

Sources

PWSID CA1910035. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Los Angeles County

All California utilities

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