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Magnolia Mutual Water

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
90 people
Connections
34
Water source
Groundwater
Based in
Courtland, CA
County
Sacramento
Owner
Private
Hardness
Moderately hard
The ZIP code it serves

95615

The short answer

1 result is above EPA’s legal limit. The worst: Arsenic, above the legal limit. 3 health-based violations since 2016.

What handles it

What was found

Arsenic, chromium (total), fluoride and nitrate: California’s own results, samples taken from May 5, 2020 to July 6, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Arsenic

Comes from the source

Above the legal limit

12ppb

Highest yearly average, 2020 to 2026

2026 average: 11 ppb

Averaged by year, the highest was 12 ppb, in 2020, above EPA’s legal limit of 10 ppb. Its highest single sample was 13 ppb. In 2026, the latest year on file, its three samples averaged 11 ppb, above the limit. EPA recorded a violation for arsenic at this utility in 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 21 ppb, in 2014, and EPA recorded violations in 2012, 2013, 2014, 2015 and 2019.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Fluoride
  • 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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: 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, 81 mg/L (4.7 grains per gallon), at its one sampling point, 2021 to 2024.

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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2023 to Sept. 30, 202411 UG/LArchived
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2023 to June 30, 202510.8 UG/LArchived
ArsenicThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageMay 1, 2019 to July 31, 20190.011 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. Arsenic, chromium (total), fluoride and nitrate results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Magnolia Mutual Water’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 5, 2020 to July 6, 2026.

Testing your own tap

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

  • Alpha Analytical Laboratories, Inc.

    Elk Grove, CA · about 11 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (707) 769-3128

  • Continental Water Laboratory

    Sacramento, CA · about 17 miles

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

    (916) 379-2323

  • Eurofins Sacramento

    West Sacramento, CA · about 19 miles

    Certified for minerals and other inorganics, organic chemicals, PFAS

    (916) 373-5600

All 145 certified labs for California

Sources

PWSID CA3400130. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Sacramento County

All California utilities

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