Jefferson Tap Water Quality Report
Jefferson's water has 4 contaminants above EPA MCLGs. We recommend using a certified water filter.
Water system
JEFFERSON WATERWORKS
People Served
7,926
Health-based violations since 2020
7
JEFFERSON WATERWORKS. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Sep 2024 · JEFFERSON WATERWORKS
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Jefferson Tap Water Safe to Drink?
We strongly recommend using a certified water filter to reduce exposure: Jefferson's water has 4 contaminants above EPA health-based guidelines. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Jefferson's water.
JEFFERSON WATERWORKS, Jefferson's water system, serves 7,926 people. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for JEFFERSON WATERWORKS is from Sep 2024.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Wisconsin
Jefferson Water Service Areas
What these numbers actually mean for Jefferson, WI
We read Jefferson, WI’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 4 contaminants above EPA MCLGs, 6 contaminants with an EPA health goal detected in some samples (no level on file) and 7 health-based EPA violations that began after the latest compliance result on file
- 152 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Jefferson's water
JEFFERSON WATERWORKS
PWSID WI1280104
JEFFERSON WATERWORKS reported 0.784 mg/L, at or above the 0.7 mg/L U.S. Public Health Service recommendation and below the 1.5 mg/L WHO guideline value and NTP neurodevelopment review level.
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Recommended Water Filters for Jefferson
Based on Jefferson's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Solventum Purification Inc.
3MRO401
NSF Certified:
Daily Production
11.48 gpd
Highlights:
- NSF-58 certified reverse osmosis system
- 11.48 GPD production capacity
- Reduces total dissolved solids (TDS) for purer water
Removes 15 contaminants:
+10 more
Copper, Cryptosporidium, Fluoride, Lead, Radium 226, Radium 228, Radium, combined (-226 & -228), Selenium, Total Dissolved Solids, Turbidity
Solventum Purification Inc.
3MRO301
NSF Certified:
Daily Production
11.48 gpd
Highlights:
- NSF-58 certified reverse osmosis system
- 11.48 GPD production capacity
- Reduces total dissolved solids (TDS) for purer water
Removes 15 contaminants:
+10 more
Copper, Cryptosporidium, Fluoride, Lead, Radium 226, Radium 228, Radium, combined (-226 & -228), Selenium, Total Dissolved Solids, Turbidity
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Verify Your Water Quality with Independent Testing
With 4 contaminants above EPA MCLGs, 6 contaminants with an EPA health goal detected in some samples (no level on file) and 7 health-based EPA violations that began after the latest compliance result on file, independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
With 4 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Jefferson's water readings can explain
Utility-reported data for Jefferson includes iron — the readings behind these common tap water questions. We publish a city-level hardness figure for Jefferson, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Jefferson? Public-water results do not apply to private wells. See Jefferson County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Jefferson
Jefferson's tap water measures 16.4 grains per gallon (280.0 mg/L) — very hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for 16.4 gpg water in Jefferson — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Wisconsin as a whole, read water softener cost in Wisconsin — priced against the plumber wage published for the state.
Frequently Asked Questions About Jefferson Tap Water
Jefferson's water has 4 contaminants above EPA MCLGs. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Jefferson's water. EPA records 7 health-based violations for JEFFERSON WATERWORKS that began after its latest compliance result on file (Aug 2022): Maximum Contaminant Level Violation, Average (Combined Radium (-226 and -228)), 7 violations, the first beginning on October 1, 2022 and the latest on April 1, 2024. Every such result predates them; its later EPA UCMR 5 results (Sep 2024) screen for unregulated contaminants and cannot show the water met this standard, so this page does not call the water safe.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach JEFFERSON WATERWORKS. For a problem with your water now (discolored water, no water, low pressure, a leak), contact JEFFERSON WATERWORKS directly.
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