Skip to content
TapBuff
ZIP

Seven Bays Estates Unlimited

What EPA’s and Washington’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
431 people
Connections
365
Water source
Groundwater
Based in
Spokane, WA
County
Lincoln
Owner
Private
Hardness
Varies by source
The ZIP code it serves

99122

The short answer

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

What handles it

What was found

Arsenic, nitrate, fluoride, total trihalomethanes (TTHM), chromium (total) and haloacetic acids (HAA5): Washington’s own results, samples taken from March 30, 2020 to May 27, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

3.1ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 3.1 ppb, in 2025: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.3 ppb, in 2016.

What handles it

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

Below EPA’s limits4

Nitrate

Comes from the source

Below EPA’s limits

2.3ppm

Highest sample; found in 10 of 10

2026, one sample: 2.3 ppm

The highest sample, in 2026, was 2.3 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 2.3 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 3.7 ppm, in 2013.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.32ppm

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 0.32 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

1.8ppb

Highest yearly average, 2020 to 2024

2024: not found

Averaged by year, the highest was 1.8 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2024, 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 yearly average of 0.66 ppb, in 2019.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Chromium (total)

Comes from the source

Below EPA’s limits

1.2ppb

Highest yearly average, 2021 to 2025

2025: not found

Averaged by year, the highest was 1.2 ppb, in 2021, below EPA’s legal limit of 100 ppb. In 2025, the latest year on file, it wasn’t found in its one sample.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Haloacetic acids (HAA5)
  • 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: 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 to hard depending on the source, 82 to 136 mg/L (4.8 to 8 grains per gallon), across 2 sampling points, 2021 to 2025.

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?Washington water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There are 4 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Arsenic, nitrate, fluoride, total trihalomethanes (TTHM), chromium (total) and haloacetic acids (HAA5) results here are Washington’s own from 2020 on, with EPA’s national file for 2012 to 2019. Seven Bays Estates Unlimited’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; Washington’s results run from March 30, 2020 to May 27, 2026.

Testing your own tap

Seven Bays Estates Unlimited’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 Washington certifies.

The 3 labs Washington certifies closest to the area Seven Bays Estates Unlimited serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Lincoln County Environmental Health Lab

    Davenport, WA · under a mile

    Certified for bacteria

    (509) 215-1034

  • Anatek Labs, Inc - Spokane

    Spokane, WA · about 39 miles

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

    (509) 838-3999

  • Tshimakain Creek Laboratories

    Spokane Valley, WA · about 42 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (509) 928-3577

All 84 certified labs for Washington

Sources

PWSID WA5377651. Rebuilt from EPA data on Oct. 18, 2026.

Also in Lincoln County

All Washington utilities

What to do next