A88/100
Green River Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 10,500 residents · Wyoming
What's In Green River's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: March 1, 2022 – May 31, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: March 1, 2022 – May 31, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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
GREEN RIVER, CITY OF
Population Served
10,500
Water Source
Purchased Surface Water
System ID
WY5601181
Frequently Asked Questions About Green River Water
Is Green River tap water safe to drink?
Green River, Wyoming tap water receives a grade of A (88/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 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 Green River's water?
Of the 69 contaminants tested in Green River's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Green River have any water quality violations?
Yes, Green River has 5 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MCL. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Green River?
Green River water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Green River's tap water come from?
Green River's drinking water is sourced from purchased surface water and supplied by GREEN RIVER, CITY OF. The system serves approximately 10,500 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Green River'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. Green River'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 Green River's water compare to other cities in Wyoming?
Green River's water quality score of 88/100 earns a grade of A, which is considered excellent. This places Green River 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 Green River's water quality?
If you have concerns about Green River'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 (GREEN RIVER, CITY 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.