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Edgar Waterworks

What EPA’s and Wisconsin’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
1,491 people
Connections
502
Water source
Groundwater
Based in
Edgar, WI
County
Marathon
Owner
Local government
Hardness
Varies by source
The ZIP code it serves

54426

The short answer

1 result is above the limit’s level with no violation recorded, and 2 more are above the health goal. The worst: Haloacetic acids (HAA5), above the limit’s level, no violation. 1 health-based violation since 2016.

What handles it

What was found

Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.7 ppm, for the period ending June 30, 1996. None since is on file, so it is not counted as a current finding.

Haloacetic acids (HAA5), arsenic, total trihalomethanes (TTHM), nitrate, fluoride and chromium (total): Wisconsin’s own results, samples taken from Jan. 30, 2020 to Sept. 24, 2026, with EPA’s 2012 to 2019 file for earlier years.

Uranium: EPA’s compliance monitoring file, samples taken from June 23, 2014 to June 23, 2014. Newer results are in the utility’s annual water quality report.

Above the limit’s level, no violation recorded1

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the limit’s level, no violation

63.8ppb

Highest yearly average, 2020 to 2026

2026 average: 36.6 ppb

Averaged by year, the highest was 63.8 ppb, in 2025, above EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its two samples averaged 36.6 ppb. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 38.1 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Above the health goal2

Uranium

Comes from the source

Above the health goal

7.5ppb

Highest yearly average, 2014

Averaged by year, the highest was 7.5 ppb, in 2014: 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

Arsenic

Comes from the source

Above the health goal

0.45ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 0.45 ppb, in 2023: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 0.9 ppb. In 2026, the latest year on file, it wasn’t found in its one sample.

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 limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

30.5ppb

Highest yearly average, 2020 to 2026

2026 average: 17.8 ppb

Averaged by year, the highest was 30.5 ppb, in 2024, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its two samples averaged 17.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 20.9 ppb, in 2017.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

3.3ppm

Highest sample; found in 11 of 11

2026, one sample: 2.5 ppm

The highest sample, in 2021, was 3.3 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 2.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.0 ppm, in 2015.

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

0.8ppm

Highest yearly average, 2020 to 2026

2026 average: 0.73 ppm

Averaged by year, the highest was 0.8 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.93 ppm. In 2026, the latest year on file, its 19 samples averaged 0.73 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.58 ppm, in 2012.

What handles it

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

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

    For: Uranium, 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 very hard depending on the source, 106 to 254 mg/L (6.2 to 14.9 grains per gallon), across 2 sampling points, 2017 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?Wisconsin water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
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. Haloacetic acids (HAA5), arsenic, total trihalomethanes (TTHM), nitrate, fluoride and chromium (total) results here are Wisconsin’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. Edgar Waterworks’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; Wisconsin’s results run from Jan. 30, 2020 to Sept. 24, 2026; EPA’s compliance samples are from June 23, 2014 to June 23, 2014.

Testing your own tap

Edgar Waterworks’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 Wisconsin certifies.

The 3 labs Wisconsin certifies closest to the area Edgar Waterworks serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • AgSource Laboratories

    Marshfield, WI · about 21 miles

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

    (715) 898-1402

  • Lincoln County Health Department

    Merrill, WI · about 24 miles

    Certified for bacteria, nitrate

    (715) 536-0307

  • US Water, LLC

    Weston, WI · about 24 miles

    Certified for bacteria, nitrate, lead and copper, metals

    (715) 842-2215

Wisconsin State Laboratory of Hygiene: Well water test kits ordered by phone and shipped free; you pay to mail the sample back, and the lab bills you after testing. Tests run from bacteria alone to a homeowner package covering bacteria, nitrate, fluoride, metals, hardness, volatile organic compounds and atrazine. Bacteria is $35, nitrate $35, lead $38, and the homeowner package $450, as of July 1, 2026. Public Environmental and Water Testing Prices, Wisconsin State Laboratory of Hygiene.

All 156 certified labs for Wisconsin

Sources

PWSID WI7370150. Rebuilt from EPA data on Oct. 18, 2026.

Also in Marathon County

All Wisconsin utilities

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