A90/100
HIGHLANDS RANCH WSD — Water Quality Report 2026
Serving 103,444 people · Colorado
Water Source
Surface Water
County
—
System ID
CO0118015
Violations
4
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 720.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 HIGHLANDS RANCH WSD
Is HIGHLANDS RANCH WSD water safe to drink?
HIGHLANDS RANCH WSD water receives a grade of A (90/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has HIGHLANDS RANCH WSD detected?
69 contaminants were tested in HIGHLANDS RANCH WSD's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does HIGHLANDS RANCH WSD have any EPA violations?
Yes, HIGHLANDS RANCH WSD has 4 EPA violation(s) on record, with the most recent in 2020. Violation types include MR.
How many people does HIGHLANDS RANCH WSD serve?
HIGHLANDS RANCH WSD serves approximately 103,444 people, Colorado.
What type of water does HIGHLANDS RANCH WSD provide?
HIGHLANDS RANCH WSD sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CO0118015.
How does HIGHLANDS RANCH WSD compare to other utilities in Colorado?
HIGHLANDS RANCH WSD scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Colorado state page for a full comparison of water systems.