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Alpine Oaks Estates LLC

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
185 people
Connections
68
Water source
Groundwater
Based in
Dana Point, CA
County
San Diego
Owner
Private
Hardness
Very hard
The ZIP code it serves

91901

The short answer

1 result is above the health goal. The worst: Nitrate, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, arsenic, chromium (total) and uranium: California’s own results, samples taken from May 21, 2020 to June 3, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Nitrate

Comes from the source

Above the health goal

12ppm

Highest sample; found in 22 of 22

2026 average: 5.2 ppm

One sample, in 2024, was above EPA’s legal limit of 10 ppm, at 12 ppm. The next sample at the same point, within 30 days, brought the average back under the limit. 10 ppm is also EPA’s health goal. In 2026, the latest year on file, its two samples averaged 5.2 ppm. EPA recorded no violation for nitrate at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.7 ppm, in 2012.

What handles it

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

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

21.8ppb

Highest yearly average, 2020 to 2025

2025, one sample: 13.3 ppb

Averaged by year, the highest was 21.8 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 26 ppb. In 2025, the latest year on file, its one sample was 13.3 ppb.

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

4.1ppb

Highest yearly average, 2020 to 2025

2025, one sample: 1.8 ppb

Averaged by year, the highest was 4.1 ppb, in 2020, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, its one sample was 1.8 ppb.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.16ppm

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 0.16 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

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

    Claim: Nitrate/Nitrite (30 ppm challenge)

    For: Nitrate

  • NSF/ANSI 58

    Claim: Nitrate/Nitrite Reduction

    For: Nitrate

    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, 360 mg/L (21.1 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 21.1 grains per gallon, 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 14 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, arsenic, chromium (total) and uranium results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Alpine Oaks Estates LLC’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 21, 2020 to June 3, 2026.

Testing your own tap

Alpine Oaks Estates LLC’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 Alpine Oaks Estates LLC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Environmental Laboratory Network, Inc.

    San Diego, CA · about 24 miles

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

    (858) 266-1666

  • Metropolitan Solutions

    National City, CA · about 25 miles

    Certified for bacteria

    (619) 831-8100

  • Analytical Environmental Lab, LLC

    San Diego, CA · about 25 miles

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

    (619) 871-8505

All 145 certified labs for California

Sources

PWSID CA3701988. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in San Diego County

All California utilities

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