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Dane 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
1,117 people
Connections
413
Water source
Groundwater
Based in
Dane, WI
County
Dane
Owner
Local government
Hardness
Very hard
The ZIP code it serves

53529

The short answer

4 results are 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

Lead and copper: EPA SDWIS monitoring periods ending 2007 to 2023.

Nitrate, arsenic, fluoride and chromium (total): Wisconsin’s own results, samples taken from Feb. 19, 2020 to Sept. 15, 2026, with EPA’s 2012 to 2019 file for earlier years.

Uranium: EPA’s compliance monitoring file, samples taken from June 23, 2014 to May 10, 2016. Newer results are in the utility’s annual water quality report.

Above the health goal4

Nitrate

Comes from the source

Above the health goal

10.8ppm

Highest sample; found in 71 of 71

2026 average: 5.4 ppm

One sample, in 2021, was above EPA’s legal limit of 10 ppm, at 10.8 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 12 samples averaged 5.4 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 4.4 ppm, in 2014.

What handles it

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

Lead

Comes from pipes, often your own

Above the health goal

3.1ppb

90th percentile, 2023

In the latest period, 9 in 10 homes sampled were at or below 3.1 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

Uranium

Comes from the source

Above the health goal

0.42ppb

Highest yearly average, 2014 to 2016

2016 average: 0.34 ppb

Averaged by year, the highest was 0.42 ppb, in 2014: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 0.49 ppb. In 2016, the latest year on file, its three samples averaged 0.34 ppb.

What handles it

Arsenic

Comes from the source

Above the health goal

0.12ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 0.12 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 0.24 ppb. In 2026, the latest year on file, it wasn’t found in any of its two samples.

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 limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.12ppm

Highest yearly average, 2020 to 2026

2026 average: 0.074 ppm

Averaged by year, the highest was 0.12 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.13 ppm. In 2026, the latest year on file, its two samples averaged 0.074 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.11 ppm, in 2017.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

2.1ppb

Highest yearly average, 2020 to 2026

2026 average: 1.8 ppb

Averaged by year, the highest was 2.1 ppb, in 2023, below EPA’s legal limit of 100 ppb. Its highest single sample was 2.4 ppb. In 2026, the latest year on file, its two samples averaged 1.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.6 ppb, in 2014.

What handles it

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: Nitrate/Nitrite (30 ppm challenge), Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Nitrate, Lead, Arsenic

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

  • NSF/ANSI 58

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

    For: Nitrate, Lead, Uranium, Arsenic

    Other certifiers’ wording: Nitrate; 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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Hardness

Very hard, typically 250 mg/L (14.6 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 at 14.6 grains per gallon, salt includedSoftener or salt-free conditioner?Wisconsin water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, arsenic, 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. Dane 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 Feb. 19, 2020 to Sept. 15, 2026; EPA’s compliance samples are from June 23, 2014 to May 10, 2016.

Testing your own tap

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

  • Public Health Madison & Dane County

    Madison, WI · about 13 miles

    Certified for bacteria

    (608) 243-0357

  • Wisconsin State Laboratory of Hygiene

    Madison, WI · about 13 miles

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

    (608) 224-6260

  • Wisconsin Department of Agriculture, Trade and Consumer Protection

    Madison, WI · about 16 miles

    Certified for bacteria

    (608) 224-4821

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 WI1130220. Rebuilt from EPA data on Oct. 18, 2026.

Also in Dane County

All Wisconsin utilities

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