Denver Water Board☆

Its service area also reaches South Platte: Denver Gage to Greeley (34.0%), South Platte: Greeley to Balzac (11.0%), Bear Creek (5.0%), Clear Creek (2.0%).

Where the water comes from

Facility	Kind	Water
MARSTON FOREBAY	Intake	Surface water
STRONTIA SPRINGS RES INTAKE	Intake	Surface water
RALSTON RESERVOIR INTAKE	Intake	Surface water
S PLATTE DIVERSION CONDUIT 20	Intake	Surface water

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

Sells water to 44 systems: BRIGHTON CITY OF, CRESTVIEW WSD, NORTH WASHINGTON STREET WSD, SOUTH ADAMS COUNTY WSD, WESTMINSTER CITY OF, AURORA CITY OF, EAST CHERRY CREEK VALLEY WSD, GLENDALE CITY OF, KEN CARYL WSD, WILLOWS WD, BOW MAR WSD, CHERRY CREEK VILLAGE WD, COLUMBINE LAKES HOA, COUNTRY HOMES LAND CO, MEADOWOOD VILLAGE MHP, PLATTE CANYON WSD, SOUTHGATE WSD, SOUTHWEST METROPOLITAN WSD, WISE PROJECT, BROOMFIELD CITY AND COUNTY OF, ADVENIR FRENCH QUARTER, ASPEN TERRACE MOBILE PARK, CHERRY CREEK VALLEY WSD, NORTH LINCOLN WSD, NORTH PECOS WSD, HIGHLANDS RANCH WSD, CHATFIELD SOUTH WD, CONSOLIDATED MUTUAL MAPLE GROVE, ALAMEDA WSD, BANCROFT CLOVER WSD, BEAR CREEK WSD, BONVUE WATER AND SANITATION DISTRICT, EDGEWATER CITY OF, GREEN MOUNTAIN WSD, HIGH VIEW WD, LAKEHURST WSD, LAKEWOOD CITY OF, MEADOWBROOK WD, SOUTH SHERIDAN WATER AND SEWER DIST, VALLEY WD, and more.

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

21 structures on DWR's record name this system as their contact (21). 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.

Compliance record

Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗

EPA's own summary: violations in 11 of the last 12 quarters. In violation for, in EPA's words: 0300=Interim Enhanced Surface Water Treatment Rule; 2005=Endrin; 2010=BHC-GAMMA; 2015=Methoxychlor; 2020=Toxaphene; 2031=Dalapon; 2032=Diquat; 2033=Endothall; 2035=Di(2-ethylhexyl) adipate; 2036=OXAMYL; 2037=Simazine; 2039=Di(2-ethylhexyl) phthalate; 2040=Picloram; 2041=Dinoseb; 2042=Hexachlorocyclopentadiene; 2043=Aldicarb sulfoxide; 2044=Aldicarb sulfone; 2046=Carbofuran; 2047=Aldicarb; 2050=Atrazine; 2051=LASSO; 2065=Heptachlor; 2067=Heptachlor epoxide; 2105=2,4-D; 2110=2,4,5-TP; 2274=HEXACHLOROBENZENE; 2306=Benzo(a)pyrene; 2326=Pentachlorophenol; 2383=Total Polychlorinated Biphenyls (PCB); 2931=1,2-DIBROMO-3-CHLOROPROPANE; 2946=ETHYLENE DIBROMIDE; 2959=Chlordane; 4006=Combined Uranium.

No health-based or open violation on the federal record for this system.

What the regulator did about it

22 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.

20 most recent of 22; the rest are on the ECHO report.

Lead and copper

The latest 90th-percentile lead result is 0.0031 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 20 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 ↗

18 samples, 450 results, 2023-03-06 to 2025-04-21. No PFAS was detected at the reporting limits; lithium was measured up to 10.8 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 Denver, Colorado?

Denver Water Board is the public water system serving 1,287,000 people in Denver County, from surface water. Its EPA public water system id is CO0116001.

Where does Denver Water Board get its water?

Denver Water Board reports surface water as its primary source. EPA lists its source facilities as MARSTON FOREBAY, STRONTIA SPRINGS RES INTAKE, RALSTON RESERVOIR INTAKE, S PLATTE DIVERSION CONDUIT 20.

Does Denver Water Board have any drinking water violations?

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