Land O Lakes Sanitary Dist
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
- 450 people
- Connections
- 182
- Water source
- Groundwater
- Based in
- Land O Lakes, WI
- County
- Vilas
- Owner
- Local government
- Hardness
- Varies by source
The ZIP code it serves
The short answer
1 result is above the health goal. The worst: Arsenic, above the health goal. 5 health-based violations since 2016.
What handles itWhat was found
Arsenic, fluoride, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and chromium (total): Wisconsin’s own results, samples taken from Jan. 14, 2020 to Aug. 25, 2026, with EPA’s 2012 to 2019 file for earlier years.
Above the health goal1
Arsenic
Comes from the source
0.18ppb
Highest yearly average, 2020 to 2023
2023: not found
Averaged by year, the highest was 0.18 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 0.37 ppb. In 2023, 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 0.5 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 limits5
Fluoride
Forms or is added in treatment
0.89ppm
Highest yearly average, 2020 to 2026
2026 average: 0.69 ppm
Averaged by year, the highest was 0.89 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.4 ppm. In 2026, the latest year on file, its 16 samples averaged 0.69 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.4 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Total trihalomethanes (TTHM)
Forms or is added in treatment
4.8ppb
Highest yearly average, 2020 to 2026
2026, one sample: 4.4 ppb
Averaged by year, the highest was 4.8 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 4.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14.8 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
0.21ppm
Highest sample; found in 1 of 2
2021 average: 0.1 ppm
The highest sample, in 2021, was 0.21 ppm, below EPA’s legal limit of 10 ppm. That is the only year on file, and its two samples averaged 0.1 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 4.8 ppm, in 2015.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Haloacetic acids (HAA5)
Forms or is added in treatment
0.93ppb
Highest yearly average, 2020 to 2026
2026, one sample: 0.22 ppb
Averaged by year, the highest was 0.93 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 0.22 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.3 ppb, in 2013.
What handles it
No certification claim covers this compound yet.
Chromium (total)
Comes from the source
0.4ppb
Highest yearly average, 2020 to 2023
2023: not found
Averaged by year, the highest was 0.4 ppb, in 2020, below EPA’s legal limit of 100 ppb. Its highest single sample was 0.79 ppb. In 2023, 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 0.6 ppb, in 2014.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- 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
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
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: 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: Arsenic
Hardness
Soft to moderately hard depending on the source, 25 to 64 mg/L (1.5 to 3.7 grains per gallon), across 2 sampling points, in 2017.
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 |
|---|---|---|---|---|
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Jan. 16, 2026 | — | 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 12, 2023 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | Oct. 2, 2021 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Feb. 2, 2020 | — | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment was not run by a certified operator as required.EPA: Treatment Technique No Certif. Operator | Oct. 2, 2018 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 27 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Arsenic, fluoride, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and chromium (total) results here are Wisconsin’s own from 2020 on, with EPA’s national file for 2012 to 2019. Land O Lakes Sanitary Dist’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 Jan. 14, 2020 to Aug. 25, 2026.
Testing your own tap
The 3 labs Wisconsin certifies closest to the area Land O Lakes Sanitary Dist serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Eagle River Health Department Laboratory
Eagle River, WI · about 16 miles
Certified for bacteria
Oneida County Health Department
Rhinelander, WI · about 34 miles
Certified for bacteria
Iron County Health Department
Hurley, WI · about 43 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 Sept. 28, 2017 to Sept. 28, 2017, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID WI7640112. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on ArsenicWhat each one does to health, where it comes from, and the certification claim that addresses it.About Arsenic
- Get the utility’s own reportLand O Lakes Sanitary Dist 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