Hydrohistorian
Ralston Valley Water & Sanitation District
Its service area also reaches South Platte: Denver Gage to Greeley (42.0%), Boulder Creek (12.0%).
Boundary traced from IRE. About 8 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| PURCHASED FROM ARVADA CO0130001 | Consecutive connection (purchased) | Surface water · from ARVADA 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 ARVADA 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 ↗
No open violation and no health-based violation on EPA's federal record for this system at the last monthly fetch. That is a record of reported compliance, not a test result: SDWIS carries violations, not routine sample values.
EPA's own summary: violations in 0 of the last 12 quarters.
No health-based or open violation on the federal record for this system.
No enforcement action against this system on the federal record.
Lead and copper
The latest 90th-percentile lead result is 0.0015 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 Arvada, Colorado?
Ralston Valley Water & Sanitation District is the public water system serving 1,610 people in Jefferson County, from purchased surface water. Its EPA public water system id is CO0130667.
Where does Ralston Valley Water & Sanitation District get its water?
Ralston Valley Water & Sanitation District reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM ARVADA CO0130001.
Does Ralston Valley Water & Sanitation District have any drinking water violations?
EPA's compliance record shows no open health-based violations for Ralston Valley Water & Sanitation 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 →