Hydrohistorian
Hidden Valley Water District
Its service area also reaches Clear Creek (7.0%).
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 |
|---|---|---|
| PURCHASED FROM CO0130030 | Consecutive connection (purchased) | Surface water · from EVERGREEN MD |
| WELL NO 1 | Well | Groundwater |
| WELL NO 2 | Well | Groundwater |
| WELL NO 3 | 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.
Wholesale connections
Buys water from EVERGREEN MD.
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
3 structures on DWR's record name this system as their contact (3). 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 |
|---|---|---|---|---|
| HIDDEN VALLEY ALV WL FLD 0702003 | WELL GROUP | GROUNDWATER: CLEAR CREEK | Clear Creek | contact: HIDDEN VALLEY MUTUAL WATER CO |
| HIDDEN VALLEY AUG 0702570 | AUGMENTATION/REPLACEMENT PLAN | UNDEFINED | Clear Creek | contact: HIDDEN VALLEY MUTUAL WATER CO |
| HIDDEN VALLEY AUG IMPACT REACH 0702907 | REACH | CLEAR CREEK | Clear Creek | contact: HIDDEN VALLEY MUTUAL WATER CO |
Compliance record
Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗
Nothing open today, but 10 health-based violations appear on the federal record historically. The history is below.
EPA's own summary: violations in 3 of the last 12 quarters, significant non-compliance in 1. In violation for, in EPA's words: 0200=Surface Water Treatment Rule; 0999=Chlorine; 8000=Revised Total Coliform Rule.
What happened
All 10 violation records on file, grouped into the 4 distinct things EPA's codes describe. Dates are the compliance period the violation is filed against.
EPA violation code 2E, contaminant 5200 — not in the code table this build carries.
Rule: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Rule: Nitrate and nitrite.
Rule: Radionuclides -- radium, uranium and gross alpha.
Every violation record, as filed (10 of 10)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2024-10-17 | code 2E | health-based | returned to compliance (2024-11-15) | ||
| 2023-12-01 | Treatment Technique No Certif. Operator | DBP Stage 1 | health-based | returned to compliance (2024-03-26) | |
| 2018-04-01 – 2018-06-30 | MCL, Average | Nitrate | health-based | returned to compliance (2018-10-01) | 11.6 MG/L (limit 10.0) |
| 2016-01-01 – 2016-03-31 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.0 PCI/L (limit 5.0) |
| 2015-10-01 – 2015-12-31 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.53 PCI/L (limit 5.0) |
| 2015-07-01 – 2015-09-30 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.05 PCI/L |
| 2015-04-01 – 2015-06-30 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.0 PCI/L (limit 5.0) |
| 2014-01-01 – 2014-03-31 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.0 PCI/L (limit 5.0) |
| 2013-10-01 – 2013-12-31 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 6.0 PCI/L (limit 5.0) |
| 2011-01-01 – 2011-12-31 | MCL, Average | Combined Radium (-226 and -228) | health-based | returned to compliance (2017-08-01) | 9.0 PCI/L (limit 5.0) |
What the regulator did about it
52 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 |
|---|---|---|
| 2024-11-15 | St Compliance achieved Completed form submitted to dept 11/15/2024. 11/18/2024 TJ |
state |
| 2024-11-07 | St Violation/Reminder Notice | state |
| 2024-11-07 | St Public Notif requested | state |
| 2024-11-07 | St Violation/Reminder Notice | state |
| 2024-11-07 | St Public Notif requested | state |
| 2024-06-04 | St Public Notif received 2023 CCR submitted 06/04/2024 direct delivered meeting tier 3 PN req TJ |
state |
| 2024-03-27 | St Compliance achieved date collected march2024 samples in accordance w/ rule to RTC |
state |
| 2024-03-26 | St Compliance achieved | state |
| 2024-03-14 | St Violation/Reminder Notice | state |
| 2024-03-14 | St Public Notif requested | state |
| 2024-03-14 | St Violation/Reminder Notice | state |
| 2024-03-14 | St Public Notif requested | state |
| 2024-02-15 | St Violation/Reminder Notice | state |
| 2024-02-15 | St Public Notif requested | state |
| 2024-02-15 | St Violation/Reminder Notice | state |
| 2024-02-15 | St Public Notif requested | state |
| 2024-02-15 | St Violation/Reminder Notice | state |
| 2024-02-15 | St Public Notif requested | state |
| 2024-01-23 | St Violation/Reminder Notice | state |
| 2024-01-23 | St Public Notif requested | state |
20 most recent of 52; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.0035 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 9 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 Evergreen, Colorado?
Hidden Valley Water District is the public water system serving 155 people in Jefferson County, from purchased surface water. Its EPA public water system id is CO0130045.
Where does Hidden Valley Water District get its water?
Hidden Valley Water District reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM CO0130030, WELL NO 1, WELL NO 2, WELL NO 3.
Does Hidden Valley Water District have any drinking water violations?
EPA's compliance record shows no open health-based violations for Hidden Valley Water District at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Jefferson 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 →