Hydrohistorian
Twilight Water Company
Modelled boundary. EPA estimated this service area (Random Forest) rather than tracing a utility-supplied map; treat the edge as approximate. About 1 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| WELL 1 | Well | Groundwater |
| WELL 2 | 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 2026-10-06 · 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 ↗
1 health-based violation open now. A health-based violation means a measured level went over a federal limit, or a required treatment step was not carried out — not a missed form. What that means for anyone drinking the water depends on the contaminant and the dose; read EPA's own report and the system's Consumer Confidence Report rather than anything inferred here.
EPA's own summary: violations in 12 of the last 12 quarters, significant non-compliance in 1. In violation for, in EPA's words: 0700=Groundwater Rule; 0999=Chlorine; 2039=Di(2-ethylhexyl) phthalate; 8000=Revised Total Coliform Rule. Currently: 0700=Groundwater Rule.
What happened
All 4 violation records 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 (4 of 4)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2017-06-02 | Failure To Address Deficiency | Groundwater Rule | health-based | open | |
| 2017-06-02 | Failure To Address Deficiency | Groundwater Rule | health-based | returned to compliance (2017-09-14) | |
| 2017-06-02 | Failure To Address Deficiency | Groundwater Rule | health-based | returned to compliance (2017-09-14) | |
| 2017-06-02 | Failure To Address Deficiency | Groundwater Rule | health-based | returned to compliance (2018-08-03) |
What the regulator did about it
35 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 |
|---|---|---|
| 2024-06-20 | St Violation/Reminder Notice | state |
| 2024-06-20 | St Public Notif requested | state |
| 2024-06-20 | St Violation/Reminder Notice | state |
| 2024-06-20 | St Public Notif requested | state |
| 2024-06-04 | St Compliance achieved | state |
| 2023-07-29 | St Compliance achieved | state |
| 2023-07-26 | St Violation/Reminder Notice | state |
| 2023-07-26 | St Public Notif requested | state |
| 2020-07-01 | St Compliance achieved | state |
| 2020-06-01 | St Violation/Reminder Notice | state |
| 2019-08-06 | St Violation/Reminder Notice | state |
| 2019-08-06 | St Public Notif requested | state |
| 2019-07-16 | St Compliance achieved sampled in next monitoring period |
state |
| 2019-07-09 | St Violation/Reminder Notice | state |
| 2019-07-09 | St Public Notif requested | state |
| 2019-06-27 | St Compliance achieved | state |
| 2018-08-29 | St Compliance achieved | state |
| 2018-08-27 | St Compliance achieved | state |
| 2018-08-03 | St Compliance achieved | state |
| 2018-07-18 | St Violation/Reminder Notice | state |
20 most recent of 35; the rest are on the ECHO report.
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. 6 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 2026-10-09 · 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 Durango, Colorado?
Twilight Water Company is the public water system serving 78 people in La Plata County, from groundwater. Its EPA public water system id is CO0134855.
Where does Twilight Water Company get its water?
Twilight Water Company reports groundwater as its primary source. EPA lists its source facilities as WELL 1, WELL 2.
Does Twilight Water Company have any drinking water violations?
EPA's compliance record shows no open health-based violations for Twilight Water Company at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in La Plata 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 →