A87/100
CWS SOUTHLAKE SYSTEM — Water Quality Report 2026
Serving 1,112 people · California
Water Source
Groundwater
County
—
System ID
CA1510039
Violations
1
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.48 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1993.
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
Frequently Asked Questions About CWS SOUTHLAKE SYSTEM
Is CWS SOUTHLAKE SYSTEM water safe to drink?
CWS SOUTHLAKE SYSTEM water receives a grade of A (87/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CWS SOUTHLAKE SYSTEM detected?
2 contaminants were tested in CWS SOUTHLAKE SYSTEM's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does CWS SOUTHLAKE SYSTEM have any EPA violations?
Yes, CWS SOUTHLAKE SYSTEM has 1 EPA violation(s) on record, with the most recent in 1993. Violation types include MCL. 1 are health-based violations.
How many people does CWS SOUTHLAKE SYSTEM serve?
CWS SOUTHLAKE SYSTEM serves approximately 1,112 people, California.
What type of water does CWS SOUTHLAKE SYSTEM provide?
CWS SOUTHLAKE SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA1510039.
How does CWS SOUTHLAKE SYSTEM compare to other utilities in California?
CWS SOUTHLAKE SYSTEM scores 87/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.