Williams Bay Tap Water Quality Report
Williams Bay's water record shows 1 contaminant above EPA MCLGs, 1 contaminant with an EPA health goal detected in some samples (no level on file) and an EPA lead 90th percentile above the 15 ppb action level. We recommend using a certified water filter.
Water system
WILLIAMS BAY WATERWORKS
People Served
2,601
Health-based violations since 2020
0
WILLIAMS BAY WATERWORKS. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Aug 2022 · WILLIAMS BAY WATERWORKS
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Williams Bay Tap Water Safe to Drink?
We strongly recommend using a certified water filter to reduce exposure: Williams Bay's water record shows 1 contaminant above EPA MCLGs, 1 contaminant with an EPA health goal detected in some samples (no level on file) and an EPA lead 90th percentile above the 15 ppb action level. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Williams Bay's water.
WILLIAMS BAY WATERWORKS, Williams Bay's water system, serves 2,601 people. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for WILLIAMS BAY WATERWORKS is from Aug 2022.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Wisconsin
Williams Bay Water Service Areas
What these numbers actually mean for Williams Bay, WI
We read Williams Bay, 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.
- 1 contaminant above EPA MCLGs, 1 contaminant with an EPA health goal detected in some samples (no level on file) and an EPA lead 90th percentile above the 15 ppb action level
- 62 results on file
- 16 PFAS compounds on record
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Fluoride in Williams Bay's water
WILLIAMS BAY WATERWORKS
PWSID WI2650060
WILLIAMS BAY WATERWORKS reported 0.742 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 Williams Bay
Based on Williams Bay's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs and to reduce lead (its water system's EPA lead 90th percentile is above the 15 ppb action level).
AquaTru
Classic
NSF Certified:
Flow Rate
0.04 gpm
Daily Production
600 gpd
Highlights:
- Best overall contaminant reduction score
- Most performance certifications
- Lifetime warranty
- NSF-42, NSF-53, NSF-58, NSF-401 certified
Removes 23 contaminants:
+18 more
Molybdenum, Barium, Chlorine, Arsenic, 83+ contaminants, Calcium, Chloride, Copper, Magnesium, Nitrate, Phosphorus, Sodium, Sulfate, Total Dissolved Solids, Zinc, Total THMs, Chloroform, Nitrate (as N)
AquaTru
Carafe
NSF Certified:
Flow Rate
0.3 gpm
Daily Production
4 gpd
Highlights:
- Verified PFAS reduction
- Glass collection vessel
- Plug-and-play installation
- NSF-53, NSF-42, NSF-58, NSF-401, NSF-372 certified
Removes 17 contaminants:
+12 more
Arsenic, 83+ contaminants, Copper, Total THMs, Chloroform, Chloride, Sulfate, Nitrate (as N), Molybdenum, Barium, Strontium, Uranium
Waterdrop
G3 P600
NSF Certified:
Flow Rate
600 gpm
Daily Production
600 gpd
Highlights:
- Space-saving design
- Good contaminant reduction
- NSF-58 certified
Removes 4 contaminants:
Waterdrop
G3 P800
NSF Certified:
Flow Rate
800 gpm
Daily Production
800 gpd
Highlights:
- High water production rate
- Modern design
- No tank needed
- NSF-42, NSF-53, NSF-58, NSF-372 certified
Removes 15 contaminants:
+10 more
Chlorine, Copper, Manganese, Potassium, Selenium, Total Dissolved Solids, Nitrate, Chloride, Sodium, Strontium
Verify Your Water Quality with Independent Testing
With 1 contaminant above EPA MCLGs, 1 contaminant with an EPA health goal detected in some samples (no level on file) and an EPA lead 90th percentile above the 15 ppb action level, 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.
What Williams Bay's water readings can explain
Utility-reported data for Williams Bay includes sulfate — the readings behind these common tap water questions. We publish a city-level hardness figure for Williams Bay, 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 Williams Bay? Public-water results do not apply to private wells. See Walworth County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Williams Bay
Williams Bay's tap water measures 6.4 grains per gallon (110.0 mg/L) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 6.4 gpg water in Williams Bay — 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 Williams Bay Tap Water
Williams Bay's water record shows 1 contaminant above EPA MCLGs, 1 contaminant with an EPA health goal detected in some samples (no level on file) and an EPA lead 90th percentile above the 15 ppb action level. 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 Williams Bay's water.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach WILLIAMS BAY WATERWORKS. For a problem with your water now (discolored water, no water, low pressure, a leak), contact WILLIAMS BAY WATERWORKS directly.
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