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A80/100

EAST DILLON WD — Water Quality Report 2026

Serving 2,501 people · Colorado

Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
CO0159045
Violations
9

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
1.72 mg/L1.30 mg/LOver Limit
Lead (90th percentile)
0.004 mg/L0.015 mg/LAbove Goal

EPA Violation History

7

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Missed required monitoring deadline

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 1, 2023 – September 30, 2023Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to complete routine monitoring

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 1, 2023 – September 30, 2023Rule: Surface Water Treatment RuleEnforcement: 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: July 1, 2023 – September 30, 2023Rule: 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: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Violation related to E. coli (RTCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2021 – October 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to complete routine monitoring

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2021 – October 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Missed required monitoring deadline

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2021 – October 31, 2021Rule: Surface Water Treatment RuleEnforcement: 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

Frequently Asked Questions About EAST DILLON WD

Is EAST DILLON WD water safe to drink?

EAST DILLON WD water receives a grade of A (80/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.

What contaminants has EAST DILLON WD detected?

2 contaminants were tested in EAST DILLON WD's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).

Does EAST DILLON WD have any EPA violations?

Yes, EAST DILLON WD has 9 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, Other.

How many people does EAST DILLON WD serve?

EAST DILLON WD serves approximately 2,501 people, Colorado.

What type of water does EAST DILLON WD provide?

EAST DILLON WD sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CO0159045.

How does EAST DILLON WD compare to other utilities in Colorado?

EAST DILLON WD scores 80/100 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.