Hydrohistorian
Eldorado Municipal System
Modelled boundary. EPA estimated this service area (Random Forest) rather than tracing a utility-supplied map; treat the edge as approximate. About 0 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| WELL D | Well | Groundwater |
| WELL H | 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.
DWR structures that name this system
Source Probable join · fetched 2026-09-09 · 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 2026-09-09 · verify at EPA ECHO ↗
Nothing open today, but 1 health-based violation appears on the federal record historically. The history is below.
EPA's own summary: violations in 0 of the last 12 quarters.
What happened
All 1 violation record on file, grouped into the 1 distinct thing EPA's codes describe. Dates are the compliance period the violation is filed against.
Rule: Groundwater Rule -- protecting wells from faecal contamination.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2011-05-20 | Failure To Address Deficiency | Groundwater Rule | health-based | returned to compliance (2014-11-10) |
What the regulator did about it
8 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 |
|---|---|---|
| 2024-02-01 | St Boil Water Order | state |
| 2022-07-28 | St Boil Water Order | state |
| 2021-12-31 | St Boil Water Order | state |
| 2021-03-31 | St Boil Water Order | state |
| 2020-02-18 | St Boil Water Order | state |
| 2017-09-27 | St Compliance achieved | state |
| 2016-11-01 | St Violation/Reminder Notice | state |
| 2016-11-01 | St Public Notif requested | state |
Lead and copper
The latest 90th-percentile lead result is 0.002 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 7 results on file.
The action level is not a health limit: it is the level at which the rule requires a system to act (corrosion control, public education, and in some cases replacing lead service lines). Lead mostly enters water from household plumbing, so a system-wide percentile does not tell you what comes out of one tap.
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 2026-09-09 · 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 Wheat Ridge, Colorado?
Eldorado Municipal System is the public water system serving 308 people in Boulder County, from groundwater. Its EPA public water system id is CO0107246.
Where does Eldorado Municipal System get its water?
Eldorado Municipal System reports groundwater as its primary source. EPA lists its source facilities as WELL D, WELL H.
Does Eldorado Municipal System have any drinking water violations?
EPA's compliance record shows no open health-based violations for Eldorado Municipal System at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Boulder County.
The record
EPA SDWIS federal reporting as of 2026-09-08; the compliance record above is EPA's own, fetched monthly, and the ECHO report carries the rest. Report a problem →