Water Quality Report · Updated October 07, 2026
CASPER, CITY OF
CASPER, CITY OF delivers tap water graded C (71/100) by TapWaterSafety.org. The utility serves approximately 59,000 residents in CASPER, Wyoming using surface water (purchased). 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. For questions, the utility can be reached at 307-235-8360.
Is CASPER tap water safe to drink?
CASPER, CITY OF delivers tap water that earns a grade of C (71/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 59,000 residents in CASPER, drawing from surface water (purchased).
Public testing data identifies 18 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Bromochloroacetic acid*, Total trihalomethanes (TTHMs)*, Bromodichloromethane*, Haloacetic acids (HAA5)*, Bromate*, Dibromoacetic acid*, Dibromochloromethane*, Dichloroacetic acid*, Radium, combined (-226 and -228)*, Trichloroacetic acid*, Uranium*, Chloroform*, Nitrate and nitrite*, Chromium (hexavalent), Thallium*, Chlorate, Bromoform*. 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 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.
Quick actions for CASPER residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CASPER, CITY OF.
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.
Contact CASPER, CITY OF
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Recommended water filters for CASPER
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 71/100 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 |
|---|---|---|---|---|---|---|---|---|
| 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CASPER, CITY OF service area
This water system serves 1 community in Natrona County, Wyoming. Click any city for its dedicated tap water quality page.
Find the right filter for CASPER water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.