Public water system record
Parker WSD
Serves Parker, Castle Pines, Lone Tree and 1 more place, Douglas County, CO · 75,949 people served
Federal records show no health-based violations and 7 monitoring/reporting issues for Parker WSD in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 7
Key facts
- Parker WSD draws water from 49 wells and 1 surface water intake (24 of them for emergency, seasonal or other part-time use).
- Record on file since 1991, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 82 unknown out of 20,005 service lines.
Check whether Parker WSD serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Jul 2, 2025 | Resolved |
|
Chlorine dioxide
Monitoring and reporting
|
Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Chlorite
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
E. coli
Monitoring and reporting
|
Feb 1, 2024 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2023 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
Full record since 1991
EPA's records for Parker WSD go back to 1991. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 188 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 2 |
| 2000s | 2 | 186 |
| 2020s | 0 | 7 |
Most recent health-based violation before October 19, 2016: Total Coliform, began August 2000, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2000 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Aug 1, 2000 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 1996 | Resolved |
Where the water comes from
Parker WSD draws water from 49 wells and 1 surface water intake (24 of them for emergency, seasonal or other part-time use). It also buys water from Wise Project. 1 other community water system buys water from Parker WSD. 1 other public water system has an interim connection to Parker WSD.
Buys water from
- Wise Project Greenwood Village, CO
Community systems that buy water from it
- Town of Castle Rock Castle Rock, CO
Annual water quality report
Parker WSD must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Colorado.
Certified drinking water labs by state EPA guidance for private wells