Hydrohistorian
Joint Water Purification Plant
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| RACE WELL 1 ACWWA | Well | Groundwater |
| WELL DD4 COTTONWOOD | Well | Groundwater |
| WELL DD1 COTTONWOOD | Well | Groundwater |
| WELL CCC4 COTTONWOOD | Well | Groundwater |
| LOYD WELL 2 ACWWA | Well | Groundwater |
These are EPA's facility records, not DWR structures. Which decreed rights sit behind an intake is the next phase; nothing here is inferred.
Wholesale connections
Sells water to 2 systems: COTTONWOOD WSD, ARAPAHOE CNTY WWWA.
DWR structures that name this system
Source Probable join · fetched 2026-10-06 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier
No DWR structure on file records this system as its contact, and none of its EPA intakes matches a structure name in its districts. DWR records a contact on only a fraction of structures, and only for districts fetched from its live service, so this is absence of a record, not evidence of no rights.
Compliance record
Source Register of another agency · fetched 2026-10-07 · verify at EPA ECHO ↗
No open violation and no health-based violation on EPA's federal record for this system at the last monthly fetch. That is a record of reported compliance, not a test result: SDWIS carries violations, not routine sample values.
EPA's own summary: violations in 0 of the last 12 quarters.
No health-based or open violation on the federal record for this system.
What the regulator did about it
3 enforcement actions on this system's federal record. In Colorado the state is the primacy agency, so most actions are the state's; EPA acts directly on tribal systems and when it steps in.
| Date | Action | By |
|---|---|---|
| 2020-07-15 | St Compliance achieved System sampled SOCA at 008 in June 2020. |
state |
| 2020-02-07 | St Violation/Reminder Notice | state |
| 2020-02-07 | St Public Notif requested | state |
No lead or copper 90th-percentile result on the federal record for this system.
Violation, enforcement and lead/copper records are EPA SDWIS federal reporting, fetched monthly; the summary is EPA ECHO. Code names come from EPA's own REF_CODE_VALUE table. SDWIS carries violations, not routine sample results — nitrate, disinfection by-product and PFAS values are not in it, and a clean record here means nothing was reported as a violation, not that nothing was ever detected. For what was measured, ask the system for its Consumer Confidence Report.
PFAS and lithium: EPA's UCMR 5 monitoring, 2023–2025
Source Register of another agency · fetched 2026-10-09 · verify at EPA UCMR occurrence data ↗
EPA did not sample this system under UCMR 5 (the rule covered every system serving more than 3,300 people and a drawn sample of smaller ones).
Common questions
Who provides drinking water in Centennial, Colorado?
Joint Water Purification Plant is the public water system in Arapahoe County, from groundwater. Its EPA public water system id is CO0103418.
Where does Joint Water Purification Plant get its water?
Joint Water Purification Plant reports groundwater as its primary source. EPA lists its source facilities as RACE WELL 1 ACWWA, WELL DD4 COTTONWOOD, WELL DD1 COTTONWOOD, WELL CCC4 COTTONWOOD.
Does Joint Water Purification Plant have any drinking water violations?
EPA's compliance record shows no open health-based violations for Joint Water Purification Plant at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Arapahoe County.
The record
EPA SDWIS federal reporting as of 2026-10-06; the compliance record above is EPA's own, fetched monthly, and the ECHO report carries the rest. Report a problem →