Stateline Mobile Home Park

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: 37 people
Connections: 23
Water source: Groundwater
Based in: Hazel Green, WI
County: Grant
Owner: Private
Hardness: Very hard

The ZIP code it serves

53811

The short answer

Nothing in EPA’s and Wisconsin’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 2 health-based violations since 2016.

What was found

Nitrate: Wisconsin’s own results, samples taken from Aug. 31, 2020 to June 4, 2026, with EPA’s 2012 to 2019 file for earlier years.

Fluoride, arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from June 19, 2018 to June 19, 2018. Newer results are in the utility’s annual water quality report.

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.18ppm

Highest yearly average, 2018

Averaged by year, the highest was 0.18 ppm, in 2018, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Nitrate

Comes from the source

Below EPA’s limits

0.2ppm

Highest sample; found in 3 of 5

2026: not found

The highest sample, in 2021, was 0.2 ppm, below EPA’s legal limit of 10 ppm. 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 sample of 0.39 ppm, in 2015.

What handles it

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

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
Lead

Hardness

Very hard, typically 315 mg/L (18.4 grains per gallon), across 2 sampling points, 2018 to 2022.

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 18.4 grains per gallon, salt included Softener or salt-free conditioner?Wisconsin water hardness, utility by utility

Violations since 2016

Contaminant or rule	Type	Period	Measured	Status
Lead and Copper Rule	Required information about lead was not given to customers.EPA: Public Education	Dec. 11, 2023	—	Resolved
Revised Total Coliform Rule	Fixes required after coliform results were not made on time.EPA: Treatment Technique, Corrective/Expedited Actions (RTCR)	March 12, 2022	—	Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 30 monitoring or reporting violations not shown.

What this report can’t tell you

Everything else. Nitrate results here are Wisconsin’s own from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic and chromium (total) come from EPA’s file alone, which ends in 2019. Stateline Mobile Home Park’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 Aug. 31, 2020 to June 4, 2026; EPA’s compliance samples are from June 19, 2018 to June 19, 2018.

Testing your own tap

Stateline Mobile Home Park’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 Stateline Mobile Home Park serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Lafayette County Health Department
Darlington, WI · about 23 miles
Certified for bacteria, nitrate
(608) 776-4895
LV Labs WW, LLC
Lancaster, WI · about 24 miles
Certified for bacteria, nitrate
(608) 723-4096
Iowa County
Dodgeville, WI · about 36 miles
Certified for bacteria
(608) 930-9870

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