Highlands Ranch Water & Sanitation District☆

Where the water comes from

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 WISE PROJECT, DENVER WATER BOARD.

Sells water to 3 systems: CASTLE PINES NORTH MD, NORTHERN DOUGLAS COUNTY WSD, ROXBOROUGH NW DOUGLAS COUNTY.

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 ↗

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.

What the regulator did about it

10 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.

Lead and copper

The latest 90th-percentile lead result is 0.002 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 17 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 ↗

8 samples, 210 results, 2024-01-29 to 2024-10-07. 4 of the 29 PFAS were detected at least once; lithium was measured up to 35.2 µg/L (no federal limit).

Rows shown: every detected contaminant plus the regulated PFAS and lithium; the rest were below their reporting limits. These are UCMR monitoring samples, not compliance samples. EPA's April 2024 rule set 4.0 ng/L (0.004 µg/L) for PFOA and PFOS, the same as UCMR 5's reporting limit, so any detection of either is at or above it; the rule's compliance date and its other limits have been under revision since 2025 and are not applied here. State PFAS sampling is on CDPHE's pages ↗.

Common questions

Who provides drinking water in Highlands Ranch, Colorado?

Highlands Ranch Water & Sanitation District is the public water system serving 103,444 people in Douglas County, from surface water. Its EPA public water system id is CO0118015.

Where does Highlands Ranch Water & Sanitation District get its water?

Highlands Ranch Water & Sanitation District reports surface water as its primary source. EPA lists its source facilities as WELL D9, WELL TD4, WELL TD5, WELL TD6.

Does Highlands Ranch Water & Sanitation District have any drinking water violations?

EPA's compliance record shows no open health-based violations for Highlands Ranch Water & Sanitation District at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.