A83/100
Casper Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 64,828 residents · Wyoming
What's In Casper's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 610.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1997.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
EVANSVILLE, TOWN OF
Population Served
2,728
Water Source
Surface Water
System ID
WY5600018
VISTA WEST WATER COMPANY
Population Served
1,600
Water Source
Purchased Surface Water
System ID
WY5600069
PIONEER WATER & SEWER DISTRICT
Population Served
1,500
Water Source
Purchased Surface Water
System ID
WY5600828
CASPER, CITY OF
Population Served
59,000
Water Source
Purchased Surface Water
System ID
WY5601415
Frequently Asked Questions About Casper Water
Is Casper tap water safe to drink?
Casper, Wyoming tap water receives a grade of A (83/100), which is considered excellent. Out of 70 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 3 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Casper's water?
Of the 70 contaminants tested in Casper's water supply, the most notable include Copper (90th percentile), Lead (90th percentile), chlorate. 1 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Casper have any water quality violations?
Yes, Casper has 29 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MON, Other. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in Casper?
Based on EPA data, using a water filter in Casper is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Casper's tap water come from?
Casper's drinking water is sourced from surface water and supplied by EVANSVILLE, TOWN OF and 3 other water system(s). The system serves approximately 64,828 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Casper's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Casper's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Casper's water compare to other cities in Wyoming?
Casper's water quality score of 83/100 earns a grade of A, which is considered excellent. This places Casper among the better-performing water systems in Wyoming. Visit our Wyoming state page to see how all cities in the state compare.
What should I do if I'm concerned about Casper's water quality?
If you have concerns about Casper's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (EVANSVILLE, TOWN OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.