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Asoleado MWC

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
101 people
Connections
36
Water source
Groundwater
Based in
Carmel Valley, CA
County
Monterey
Owner
Private
Hardness
Varies by source
The ZIP code it serves

93924

The short answer

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

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2013 to 2025.

Arsenic, fluoride, chromium (total), nitrate and total trihalomethanes (TTHM): California’s own results, samples taken from Jan. 7, 2020 to June 15, 2026, with EPA’s 2012 to 2019 file for earlier years.

Uranium: EPA’s compliance monitoring file, samples taken from May 21, 2019 to May 21, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal3

Lead

Comes from pipes, often your own

Above the health goal

6.2ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 6.2 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

Arsenic

Comes from the source

Above the health goal

1.2ppb

Highest yearly average, 2021 to 2026

2026: not found

Averaged by year, the highest was 1.2 ppb, in 2024: 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 1.0 ppb, in 2017.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Uranium

Comes from the source

Above the health goal

1.5ppb

Highest yearly average, 2019

Averaged by year, the highest was 1.5 ppb, in 2019: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file.

What handles it

Below EPA’s limits3

Fluoride

Forms or is added in treatment

Below EPA’s limits

2.0ppm

Highest yearly average, 2020 to 2026

2026 average: 1.5 ppm

Averaged by year, the highest was 2.0 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 4.0 ppm. In 2026, the latest year on file, its eight samples averaged 1.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.0 ppm, in 2014.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

7.0ppb

Highest yearly average, 2021 to 2026

2026: not found

Averaged by year, the highest was 7.0 ppb, in 2025, 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 3.0 ppb, in 2014.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.6ppm

Highest sample; found in 4 of 28

2026: not found

The highest sample, in 2021, was 0.6 ppm, below EPA’s legal limit of 10 ppm. In 2026, 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 sample of 0.4 ppm, in 2016.

What handles it

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

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: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Lead, Arsenic

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

  • NSF/ANSI 58

    Claims: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction, Uranium

    For: Lead, Arsenic, Uranium

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

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 water filters for lead, ranked

The best reverse osmosis systems, ranked

Hardness

Moderately hard to very hard depending on the source, 112 to 308 mg/L (6.5 to 18 grains per gallon), across 4 sampling points, 2021 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, 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.

What this report can’t tell you

  • Everything else. Arsenic, fluoride, chromium (total), nitrate and total trihalomethanes (TTHM) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Uranium comes from EPA’s file alone, which ends in 2019. Asoleado MWC’s own annual report, which it must send you every year, has newer results for those and 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 June 15, 2026; EPA’s compliance samples are from May 21, 2019 to May 21, 2019.

Testing your own tap

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

  • Monterey Bay Analytical Services, Inc.

    Monterey, CA · about 15 miles

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

    (831) 375-6227

  • Monterey County Consolidated Environmental Laboratory

    Salinas, CA · about 19 miles

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

    (831) 755-4516

  • CM Analytical, Inc.

    Gilroy, CA · about 41 miles

    Certified for bacteria

    (408) 848-3619

All 145 certified labs for California

Sources

PWSID CA2702148. Rebuilt from EPA data on Oct. 18, 2026.

Also in Monterey County

All California utilities

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