B68/100
Green Valley Lake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 2,993 residents · California
What's In Green Valley Lake's Tap Water?
2
Contaminants Tested
2
Exceed EPA Limits
0
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.73 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.025 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
TIER 3Resolved
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: February 1, 2023 – March 1, 2023Rule: Consumer Confidence RuleEnforcement: Formal — state order issued
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 VALLEY MWC
Population Served
2,993
Water Source
Purchased Surface Water
System ID
CA3610023
Frequently Asked Questions About Green Valley Lake Water
Is Green Valley Lake tap water safe to drink?
Green Valley Lake, California tap water receives a grade of B (68/100), which is considered good. Out of 2 contaminants tested, 2 exceed EPA maximum contaminant levels (MCLs) and 2 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 Valley Lake's water?
Of the 2 contaminants tested in Green Valley Lake's water supply, the most notable include Lead (90th percentile), Copper (90th percentile). 2 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Green Valley Lake have any water quality violations?
Yes, Green Valley Lake has 8 EPA violation(s) on record, with the most recent in 2024. Violation types include MCL, MR. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Green Valley Lake?
Based on EPA data, using a water filter in Green Valley Lake is recommended. 2 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 Green Valley Lake's tap water come from?
Green Valley Lake's drinking water is sourced from purchased surface water and supplied by GREEN VALLEY MWC. The system serves approximately 2,993 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Green Valley Lake'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 Valley Lake'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 Valley Lake's water compare to other cities in California?
Green Valley Lake's water quality score of 68/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Green Valley Lake's water quality?
If you have concerns about Green Valley Lake'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 VALLEY MWC) 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.