Water Quality Report · Updated October 07, 2026
WEST ALLIS WATERWORKS
WEST ALLIS WATERWORKS delivers tap water graded C (66/100) by TapWaterSafety.org. The utility serves approximately 63,240 residents in WEST ALLIS, Wisconsin using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Total PFOS and PFOA* significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline.
Is WEST ALLIS tap water safe to drink?
WEST ALLIS WATERWORKS delivers tap water that earns a grade of C (66/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 63,240 residents in WEST ALLIS, drawing from surface water (purchased).
Public testing data identifies 16 contaminants in this water above EWG's health-based guidelines, including: Total PFOS and PFOA*, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Bromodichloromethane, Haloacetic acids (HAA5), Dibromochloromethane, Bromate*, Dibromoacetic acid, Chloroform, Chromium (hexavalent), Dichloroacetic acid, Trichloroacetic acid, Perfluorooctanoic acid (PFOA)*, Perfluorooctane sulfonate (PFOS)*, Nitrate*, Nitrate and nitrite*. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for WEST ALLIS WATERWORKS (system ID WI2410595) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for WEST ALLIS residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for WEST ALLIS WATERWORKS.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS)*, Perfluorooctanoic acid (PFOA)* detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Total PFOS and PFOA* significantly above health guideline
Moderate concernTotal PFOS and PFOA* detected at 3.4 ppt, 486x above the EWG health guideline of 0.007 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 6.6 ppb, 110x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 9.86 ppb, 66x above the EWG health guideline of 0.15 ppb.
Contact WEST ALLIS WATERWORKS
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Recommended water filters for WEST ALLIS
Filters matched to the specific contaminants in this water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 66/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Total PFOS and PFOA* PFAS |
3.4 ppt | 0.007 | — | 100 | 100 | 0.007 | — | 486× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
6.6 ppb | 0.06 | — | — | — | — | — | 110× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
9.86 ppb | 0.15 | 80.0 | 100 | — | — | — | 66× over |
| Bromodichloromethane Disinfection byproduct |
3.42 ppb | 0.06 | — | — | — | — | — | 57× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
2.87 ppb | 0.1 | 60.0 | 60 | — | — | — | 29× over |
| Dibromochloromethane Disinfection byproduct |
2.11 ppb | 0.1 | — | — | — | — | — | 21× over |
| Bromate* Disinfection byproduct |
1.72 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 17× over |
| Dibromoacetic acid Disinfection byproduct |
0.463 ppb | 0.03 | — | — | — | — | — | 15× over |
| Chloroform Disinfection byproduct |
3.99 ppb | 0.4 | — | — | — | — | — | 10× over |
| Chromium (hexavalent) Heavy metal |
0.204 ppb | 0.02 | — | — | — | — | — | 10× over |
| Dichloroacetic acid Disinfection byproduct |
1.58 ppb | 0.2 | — | — | — | — | — | 7.9× over |
| Trichloroacetic acid Disinfection byproduct |
0.756 ppb | 0.1 | — | — | — | — | — | 7.6× over |
| Perfluorooctanoic acid (PFOA)* PFAS |
0.675 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 7.5× over |
| Perfluorooctane sulfonate (PFOS)* PFAS |
1.03 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 3.4× over |
| Nitrate* Inorganic |
0.355 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.5× over |
| Nitrate and nitrite* Inorganic |
0.317 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.3× over |
| Bromoform Disinfection byproduct |
0.335 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
49.2 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Atrazine* Pesticide/Herbicide |
0.0195 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Antimony* Heavy metal |
0.17 ppb | 1.0 | 6.0 | 10 | 20 | 1 | — | Below guideline |
| Barium* Heavy metal |
19.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.633 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.272 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.232 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0523 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0196 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.118 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total)* Heavy metal |
0.795 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.597 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
WEST ALLIS WATERWORKS service area
This water system serves 1 community in Milwaukee County, Wisconsin. Click any city for its dedicated tap water quality page.
Find the right filter for WEST ALLIS water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.