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Sunnyside Farms 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
436 people
Connections
160
Water source
Surface water bought from another system
Based in
Palmdale, CA
County
Los Angeles
Owner
Private
Hardness
Very hard
The ZIP code it serves

93551

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Nitrate, above the legal limit. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2016 to 2026.

Nitrate, chromium (total), fluoride, arsenic, total trihalomethanes (TTHM) and uranium: California’s own results, samples taken from Jan. 22, 2020 to June 17, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Nitrate

Comes from the source

Above the legal limit

10.5ppm

Highest sample; found in 124 of 126

2026 average: 6.7 ppm

One sample, in 2025, was above EPA’s legal limit of 10 ppm, at 10.5 ppm. No follow-up sample at that point within 30 days is on file. In 2026, the latest year on file, its 15 samples averaged 6.7 ppm. EPA recorded a violation for nitrate at this utility in 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 9.0 ppm, in 2017.

What handles it

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

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

7.0ppb

90th percentile, 2024 to 2026

In the latest period, 9 in 10 homes sampled were at or below 7.0 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

Chromium (total)

Comes from the source

Below EPA’s limits

15ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 15 ppb, in 2024, below EPA’s legal limit of 100 ppb. Its highest single sample was 16 ppb. In 2026, the latest year on file, it wasn’t found in any of its three samples.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.2ppm

Highest yearly average, 2020 to 2026

2026 average: 0.2 ppm

Averaged by year, the highest was 0.2 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its three samples averaged 0.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.23 ppm, in 2014.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Total trihalomethanes (TTHM)
  • Uranium

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: Nitrate/Nitrite (30 ppm challenge), Lead Reduction

    For: Nitrate, Lead

  • NSF/ANSI 58

    Claims: Nitrate/Nitrite Reduction, Lead Reduction

    For: Nitrate, Lead

    Other certifiers’ wording: Nitrate

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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Hardness

Very hard, typically 398 mg/L (23.3 grains per gallon), across 5 sampling points, 2020 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 23.3 grains per gallon, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
NitrateA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleOct. 1, 2025 to Dec. 31, 202510.5 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 5 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, chromium (total), fluoride, arsenic, total trihalomethanes (TTHM) and uranium results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Sunnyside Farms 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 Jan. 22, 2020 to June 17, 2026.

Testing your own tap

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

  • Pat-Chem Laboratories

    San Fernando, CA · about 25 miles

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

    (800) 400-5227

  • EMSL Analytical, Inc. (LA Testing)

    South Pasadena, CA · about 34 miles

    Certified for bacteria, asbestos

    (323) 254-9960

  • Positive Lab Service

    Los Angeles, CA · about 40 miles

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

    (213) 745-5312

All 145 certified labs for California

Sources

PWSID CA1900146. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Los Angeles County

All California utilities

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