Hydrohistorian
Town of Nucla
Serves Nucla.
Boundary traced from WSP. About 9 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| PURCHASED FROM MUSTANG WA CO0143525 | Consecutive connection (purchased) | Surface water · from MUSTANG WATER AUTHORITY |
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
Buys water from MUSTANG WATER AUTHORITY.
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 2 health-based violations appear on the federal record historically. The history is below.
EPA's own summary: violations in 10 of the last 12 quarters. In violation for, in EPA's words: 0200=Surface Water Treatment Rule; 0999=Chlorine; 2456=Total Haloacetic Acids (HAA5); 2950=TTHM.
What happened
All 2 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: Stage 2 Disinfectants and Disinfection Byproducts Rule.
Every violation record, as filed (2 of 2)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2016-10-01 – 2016-12-31 | MCL, Average | TTHM | health-based | returned to compliance (2017-02-15) | 0.08887 MG/L (limit 0.08) |
| 2016-07-01 – 2016-09-30 | MCL, Average | TTHM | health-based | returned to compliance (2017-02-15) | 0.09931 MG/L (limit 0.08) |
What the regulator did about it
53 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 |
|---|---|---|
| 2025-07-22 | St Compliance achieved | state |
| 2024-10-24 | St Compliance achieved System submitted 2023 consumer notice on 10/24/2024 lmf 10/28/2024 |
state |
| 2024-10-15 | St Violation/Reminder Notice | state |
| 2024-10-15 | St Public Notif requested | state |
| 2024-06-10 | St Compliance achieved Lab uploaded results on 6/10/2024 lmf 7/25/2024 |
state |
| 2024-05-14 | St Violation/Reminder Notice | state |
| 2024-05-14 | St Public Notif requested | state |
| 2024-02-06 | St Boil Water Order | state |
| 2024-01-02 | St Violation/Reminder Notice | state |
| 2024-01-02 | St Public Notif requested | state |
| 2023-12-12 | St Violation/Reminder Notice | state |
| 2023-12-12 | St Public Notif requested | state |
| 2023-12-11 | St Compliance achieved | state |
| 2023-11-03 | St Compliance achieved System collected next required routine sampling lmf 12/5/2023 |
state |
| 2023-10-25 | St Violation/Reminder Notice | state |
| 2023-10-25 | St Public Notif requested | state |
| 2023-10-25 | St Violation/Reminder Notice | state |
| 2023-10-25 | St Public Notif requested | state |
| 2023-10-13 | St Compliance achieved SOX sample reported in accordance with the rule 10/13/2023 FCL; |
state |
| 2023-05-31 | St Boil Water Order BWA |
state |
20 most recent of 53; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.0011 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 Nucla, Colorado?
The Town of Nucla is the public water system serving 875 people in Montrose County, from purchased surface water. Its EPA public water system id is CO0143559.
Where does the Town of Nucla get its water?
The Town of Nucla reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM MUSTANG WA CO0143525.
Does the Town of Nucla have any drinking water violations?
EPA's compliance record shows no open health-based violations for the Town of Nucla at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Places this system serves
Census places its EPA service-area boundary substantially covers. Each page lists every system serving that place.
Every provider in Montrose 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 →