Westboro San Dist 1
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
- 150 people
- Connections
- 71
- Water source
- Groundwater
- Based in
- Westboro, WI
- County
- Taylor
- Owner
- Local government
- Hardness
- Hard
The ZIP code it serves
The short answer
2 results are above the health goal. The worst: Lead, above the health goal. 4 health-based violations since 2016.
What handles itWhat was found
Lead and copper: EPA SDWIS monitoring periods ending 2003 to 2023.
Arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, chromium (total) and nitrate: Wisconsin’s own results, samples taken from Sept. 30, 2020 to Aug. 30, 2026, with EPA’s 2012 to 2019 file for earlier years.
Above the health goal2
Lead
Comes from pipes, often your own
1.0ppb
90th percentile, 2023
In the latest period, 9 in 10 homes sampled were at or below 1.0 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
- NSF/ANSI 53 look for “Lead Reduction”
- NSF/ANSI 58 look for “Lead Reduction”
Arsenic
Comes from the source
0.39ppb
Highest yearly average, 2020 to 2026
2026: not found
Averaged by year, the highest was 0.39 ppb, in 2020: 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 0.6 ppb, in 2014.
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
Haloacetic acids (HAA5)
Forms or is added in treatment
43.7ppb
Highest yearly average, 2022 to 2026
Averaged by year, the highest was 43.7 ppb, in 2026, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 5.9 ppb, in 2014.
What handles it
No certification claim covers this compound yet.
Total trihalomethanes (TTHM)
Forms or is added in treatment
50.9ppb
Highest yearly average, 2022 to 2026
2026, one sample: 41.2 ppb
Averaged by year, the highest was 50.9 ppb, in 2025, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 41.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.5 ppb, in 2019.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Fluoride
Forms or is added in treatment
0.19ppm
Highest yearly average, 2020 to 2026
2026, one sample: 0.19 ppm
Averaged by year, the highest was 0.19 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 0.19 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.22 ppm, in 2014.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Chromium (total)
- Nitrate
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
For: Lead, Arsenic
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
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Lead, Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Lead, Arsenic
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Lead, Arsenic
Brita Tahoe Pitcher with Elite Filter (OB60, OB06)
Pitcher
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 13, 2026
- IAPMO listing:NSF/ANSI 53checked Oct. 13, 2026
Certified for: Lead
Hardness
Hard, 145 mg/L (8.5 grains per gallon), at its one sampling point, 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.
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | July 2, 2025 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | July 2, 2022 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | July 2, 2019 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | June 2, 2016 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 9 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, chromium (total) and nitrate results here are Wisconsin’s own from 2020 on, with EPA’s national file for 2012 to 2019. Westboro San Dist 1’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; Wisconsin’s results run from Sept. 30, 2020 to Aug. 30, 2026.
Testing your own tap
The 3 labs Wisconsin certifies closest to the area Westboro San Dist 1 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Lincoln County Health Department
Merrill, WI · about 30 miles
Certified for bacteria, nitrate
Rusk County Health and Human Services
Ladysmith, WI · about 37 miles
Certified for bacteria
Marathon County Public Health Laboratory
Wausau, WI · about 48 miles
Certified for bacteria, nitrate
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 WisconsinSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Wisconsin Department of Natural Resources, Drinking Water Program, results from Jan. 2, 2020 to Oct. 5, 2026, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Wisconsin DNR and DATCP, certified and approved drinking water laboratories, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: Wisconsin Department of Natural Resources, Drinking Water Program, results from Aug. 9, 2017 to April 28, 2026, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID WI8610346. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on the 2 results above a lineWhat each one does to health, where it comes from, and the certification claim that addresses it.Start with Lead
- Get the utility’s own reportWestboro San Dist 1 must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs