Hydrohistorian
Costilla County Water System
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 |
|---|---|---|
| LA VALLEY WELL | Well | Groundwater |
| CHAMA WELL | Well | Groundwater |
| LOS FUERTES WELL | Well | Groundwater |
| CHAMA WELL NO 2 | Well | Groundwater |
| LOS FUERTES WELL NO 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 2026-09-09 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier
1 structure on DWR's record 1 matches an EPA intake by name. A match says who DWR lists, not who owns the water: a ditch company can own the headgate while the system owns shares, and a consultant can be the contact. The dossier holds the decree.
| Structure | Type | Source | District | Matched on |
|---|---|---|---|---|
| LOS FUERTES WELL 2405029 | 2 | CULEBRA CREEK | Culebra Creek | intake name: LOS FUERTES WELL |
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: Lead and Copper Rule -- corrosion of household plumbing.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2006-07-01 | OCCT/SOWT Study/Recommendation | Lead and Copper Rule | health-based | returned to compliance (2008-08-25) |
What the regulator did about it
17 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 |
|---|---|---|
| 2023-08-09 | St Compliance achieved RTC with 3Q2023 compliant sample |
state |
| 2022-11-02 | St Violation/Reminder Notice | state |
| 2022-11-02 | St Public Notif requested | state |
| 2021-01-20 | St Violation/Reminder Notice | state |
| 2021-01-20 | St Public Notif requested | state |
| 2021-01-20 | St Compliance achieved | state |
| 2017-11-13 | St Compliance achieved RTC when reported 4Q2016 rads data late. ejc |
state |
| 2017-11-13 | St Compliance achieved RTC with next quarter's sampling. ejc |
state |
| 2017-02-10 | St Violation/Reminder Notice | state |
| 2017-02-10 | St Public Notif requested | state |
| 2017-02-10 | St Violation/Reminder Notice | state |
| 2017-02-10 | St Public Notif requested | state |
| 2016-09-16 | St Compliance achieved | state |
| 2016-07-15 | St Violation/Reminder Notice | state |
| 2016-07-15 | St Public Notif requested | state |
| 2016-05-06 | St Violation/Reminder Notice | state |
| 2016-05-06 | St Public Notif requested | state |
Lead and copper
The latest 90th-percentile lead result is 0.0 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 2026-09-09 · 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 San Luis, Colorado?
Costilla County Water System is the public water system serving 561 people in Costilla County, from groundwater. Its EPA public water system id is CO0112300.
Where does Costilla County Water System get its water?
Costilla County Water System reports groundwater as its primary source. EPA lists its source facilities as LA VALLEY WELL, CHAMA WELL, LOS FUERTES WELL, CHAMA WELL NO 2.
Does Costilla County Water System have any drinking water violations?
EPA's compliance record shows no open health-based violations for Costilla County Water System at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Costilla 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 →