Tap Water Quality Report
Tap water quality in CASPER, Wyoming
Tap water in CASPER, Wyoming receives a grade of C (71/100) from TapWaterSafety.org. It's served by CASPER, CITY OF. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Bromochloroacetic acid* significantly above health guideline; Total trihalomethanes (TTHMs)* significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CASPER's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CASPER.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 13.0 ppb, 217x above the EWG health guideline of 0.06 ppb.
Bromochloroacetic acid* significantly above health guideline
Moderate concernBromochloroacetic acid* detected at 2.58 ppb, 129x above the EWG health guideline of 0.02 ppb.
Total trihalomethanes (TTHMs)* significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs)* detected at 10.6 ppb, 71x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for CASPER, CITY OF (system ID WY5601415) 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.
Recommended filters for CASPER
Filters matched to the specific contaminants in CASPER's water supply.
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.
All contaminants detected in CASPER's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
13.0 ppb | 0.06 | — | — | — | — | — | 217× over |
| Bromochloroacetic acid* Disinfection byproduct |
2.58 ppb | 0.02 | — | — | — | — | — | 129× over |
| Total trihalomethanes (TTHMs)* Disinfection byproduct |
10.6 ppb | 0.15 | 80.0 | 100 | — | — | — | 71× over |
| Bromodichloromethane* Disinfection byproduct |
3.69 ppb | 0.06 | — | — | — | — | — | 61× over |
| Haloacetic acids (HAA5)* Disinfection byproduct |
5.54 ppb | 0.1 | 60.0 | 60 | — | — | — | 55× over |
| Bromate* Disinfection byproduct |
5.38 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 54× over |
| Dibromoacetic acid* Disinfection byproduct |
1.39 ppb | 0.03 | — | — | — | — | — | 46× over |
| Dibromochloromethane* Disinfection byproduct |
3.41 ppb | 0.1 | — | — | — | — | — | 34× over |
| Dichloroacetic acid* Disinfection byproduct |
3.09 ppb | 0.2 | — | — | — | — | — | 15× over |
| Radium, combined (-226 and -228)* Radiological |
0.75 pCi/L | 0.05 | 5.0 | — | — | — | — | 15× over |
| Trichloroacetic acid* Disinfection byproduct |
0.814 ppb | 0.1 | — | — | — | — | — | 8.1× over |
| Uranium* Radiological |
2.95 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 6.9× over |
| Chloroform* Disinfection byproduct |
2.73 ppb | 0.4 | — | — | — | — | — | 6.8× over |
| Nitrate and nitrite* Inorganic |
0.266 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.9× over |
| Chromium (hexavalent) Heavy metal |
0.037 ppb | 0.02 | — | — | — | — | — | 1.8× over |
| Thallium* Heavy metal |
0.16 ppb | 0.1 | 2.0 | — | — | — | — | 1.6× over |
| Chlorate Disinfection byproduct |
307.0 ppb | 210.0 | — | — | — | — | — | 1.5× over |
| Bromoform* Disinfection byproduct |
0.726 ppb | 0.5 | — | — | — | — | — | 1.5× over |
| Manganese Heavy metal |
16.1 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Selenium* Heavy metal |
1.2 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Molybdenum Other |
1.53 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.362 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid* Disinfection byproduct |
0.2 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid* Disinfection byproduct |
0.0411 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.55 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.32 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
38.6 ppb | — | — | — | — | — | — | 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CASPER, CITY OF.