Hydrohistorian
Tanglewood Water System
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 |
|---|---|---|
| WELL NO 1 | 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
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 ↗
1 violation open now, none health-based. These are monitoring, reporting or notice requirements — a sample not taken, or a result not filed on time. They are real obligations, but they are not a finding about the water itself.
EPA's own summary: violations in 12 of the last 12 quarters. In violation for, in EPA's words: 7000=Consumer Confidence Rule. Currently: 7000=Consumer Confidence Rule.
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: Consumer Confidence Report -- the annual report to customers.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 1999-10-19 | CCR Complete Failure to Report | Consumer Confidence Rule | other | open | 0.0 (limit 0.0) |
No enforcement action against this system on the federal record.
Lead and copper
The latest 90th-percentile lead result is 0.015 mg/L (sampling period ending 2026-06-30) against an action level of 0.015 mg/L, below it. 21 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 Silverthorne, Colorado?
Tanglewood Water System is the public water system serving 60 people in Summit County, from groundwater. Its EPA public water system id is CO0159120.
Where does Tanglewood Water System get its water?
Tanglewood Water System reports groundwater as its primary source. EPA lists its source facilities as WELL NO 1.
Does Tanglewood Water System have any drinking water violations?
EPA's compliance record shows no open health-based violations for Tanglewood Water System at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Summit 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 →