Skip to content
TapBuff
ZIP

Sleepy Valley 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
160 people
Connections
57
Water source
Groundwater
Based in
Santa Clarita, CA
County
Los Angeles
Owner
Private
Hardness
Very hard
The ZIP code it serves

91390

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

Nitrate, uranium, chromium (total), fluoride, total trihalomethanes (TTHM) and arsenic: California’s own results, samples taken from May 6, 2020 to July 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Nitrate

Comes from the source

Above the legal limit

17.9ppm

Highest sample; found in 149 of 150

2026 average: 4.3 ppm

From 2021 to 2022, 20 samples were above EPA’s legal limit of 10 ppm, the highest 17.9 ppm in 2021. The next sample at the same point, within 30 days, kept the average above the limit for 11; one came back under and eight have no follow-up sample on file within 30 days. In 2026, the latest year on file, its 14 samples averaged 4.3 ppm. EPA recorded a violation for nitrate at this utility in 2021. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 12.1 ppm, in 2019.

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

Uranium

Comes from the source

Above the health goal

13ppb

Highest yearly average, 2024 to 2026

2026 average: 7.0 ppb

Averaged by year, the highest was 13 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 14.4 ppb. In 2026, the latest year on file, its two samples averaged 7.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 7.4 ppb, in 2019.

What handles it

Below EPA’s limits3

Chromium (total)

Comes from the source

Below EPA’s limits

20ppb

Highest yearly average, 2020 to 2023

2023 average: 15 ppb

Averaged by year, the highest was 20 ppb, in 2020, below EPA’s legal limit of 100 ppb. Its highest single sample was 21 ppb. In 2023, the latest year on file, its two samples averaged 15 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.0 ppb, in 2014.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.35ppm

Highest yearly average, 2020 to 2023

Averaged by year, the highest was 0.35 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.4 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.35 ppm, in 2017.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

2.0ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 2.0 ppb, in 2020, below EPA’s legal limit of 80 ppb. Its highest single sample was 4.0 ppb. In 2025, the latest year on file, it wasn’t found in any of its two samples.

What handles it

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

    For: Nitrate

  • NSF/ANSI 58

    Claims: Nitrate/Nitrite Reduction, Uranium

    For: Nitrate, Uranium

    Other certifiers’ wording: Nitrate

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, typically 579 mg/L (33.9 grains per gallon), across 2 sampling points, 2020 to 2023.

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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
NitrateThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2021 to Dec. 31, 202113.9 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, uranium, chromium (total), fluoride, total trihalomethanes (TTHM) and arsenic results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Sleepy Valley 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 May 6, 2020 to July 1, 2026.

Testing your own tap

Sleepy Valley 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 Sleepy Valley 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 18 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 33 miles

    Certified for bacteria, asbestos

    (323) 254-9960

  • Positive Lab Service

    Los Angeles, CA · about 37 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 CA1900903. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Los Angeles County

All California utilities

What to do next