Hydrohistorian
The Grove at Alta Ridge
Boundary OSM from US EPA Office of Research and Development. About 0 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| PURCHASED FROM CO0101150 CITY THORNTON | Consecutive connection (purchased) | Surface water · from THORNTON CITY OF |
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 THORNTON CITY OF.
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: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2022-08-06 | Treatment Technique No Certif. Operator | DBP Stage 1 | health-based | returned to compliance (2022-09-06) |
What the regulator did about it
34 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 |
|---|---|---|
| 2023-09-01 | St Public Notif received Submitted PN and COD 9/3/2023 via Portal |
state |
| 2022-11-27 | St Compliance achieved MP submitted to portal including DBP sites 11/27/2022 TJ |
state |
| 2022-11-22 | St Compliance achieved SOX'd with 11/22/2022 Q4 results**5/3/2023 TJ |
state |
| 2022-11-03 | St Violation/Reminder Notice | state |
| 2022-11-03 | St Public Notif requested | state |
| 2022-11-03 | St Violation/Reminder Notice | state |
| 2022-11-03 | St Public Notif requested | state |
| 2022-10-27 | St Compliance achieved System RTCd with sample results and reporting total chlorine. AS; |
state |
| 2022-10-19 | St Violation/Reminder Notice | state |
| 2022-10-19 | St Public Notif requested | state |
| 2022-10-19 | St Violation/Reminder Notice | state |
| 2022-10-19 | St Public Notif requested | state |
| 2022-10-17 | St Violation/Reminder Notice | state |
| 2022-10-17 | St Public Notif requested | state |
| 2022-10-08 | St Public Notif received | state |
| 2022-10-08 | St Compliance achieved System submitted PN for no certified operator. AS; |
state |
| 2022-10-04 | St Violation/Reminder Notice | state |
| 2022-09-16 | St Violation/Reminder Notice | state |
| 2022-09-16 | St Public Notif requested | state |
| 2022-09-16 | St Violation/Reminder Notice | state |
20 most recent of 34; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.0 mg/L (sampling period ending 2023-12-31) against an action level of 0.015 mg/L, below it. 3 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 Thornton, Colorado?
The Grove at Alta Ridge is the public water system serving 1,300 people, from purchased surface water. Its EPA public water system id is CO0101320.
Where does The Grove at Alta Ridge get its water?
The Grove at Alta Ridge reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM CO0101150 CITY THORNTON.
Does The Grove at Alta Ridge have any drinking water violations?
EPA's compliance record shows no open health-based violations for The Grove at Alta Ridge at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
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 →