Hydrohistorian
City of Dacono
Serves Dacono.
Its service area also reaches St. Vrain Creek (22.0%).
Modelled boundary. EPA estimated this service area (Random Forest) rather than tracing a utility-supplied map; treat the edge as approximate. About 5 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| PURCHASED FROM CENTRAL WELD CO0162122 | Consecutive connection (purchased) | Surface water · from CENTRAL WELD CNTY WD |
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 CENTRAL WELD CNTY WD.
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
1 structure on DWR's record names this system as its contact (1). 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 |
|---|---|---|---|---|
| DACONO ENTITY ID 0202686 | ENTITY | SOUTH PLATTE RIVER | South Platte: Denver Gage to Greeley | contact: CITY OF DACONO |
Compliance record
Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗
Nothing open today, but 1 health-based violation appears on the federal record historically. The history is below.
EPA's own summary: violations in 1 of the last 12 quarters. In violation for, in EPA's words: 2456=Total Haloacetic Acids (HAA5); 2950=TTHM.
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: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2022-01-01 | Treatment Technique No Certif. Operator | DBP Stage 1 | health-based | returned to compliance (2022-01-13) |
What the regulator did about it
13 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 |
|---|---|---|
| 2026-01-21 | St Violation/Reminder Notice | state |
| 2026-01-21 | St Public Notif requested | state |
| 2026-01-15 | St Compliance achieved SOX 1/15/26 DBP samples reported in accordance with the rule FCL |
state |
| 2023-01-27 | St Boil Water Order BWA |
state |
| 2022-05-02 | St Public Notif received | state |
| 2022-03-08 | St Compliance achieved | state |
| 2022-02-16 | St Violation/Reminder Notice | state |
| 2022-01-13 | St Compliance achieved | state |
| 2022-01-06 | St Violation/Reminder Notice | state |
| 2022-01-06 | St Public Notif requested | state |
| 2016-04-27 | St Violation/Reminder Notice | state |
| 2016-04-27 | St Public Notif requested | state |
| 2016-04-12 | St Compliance achieved | state |
Lead and copper
The latest 90th-percentile lead result is 0.003 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 ↗
6 samples, 120 results, 2024-02-13 to 2024-12-04. No PFAS was detected at the reporting limits; lithium was not detected.
| Contaminant | Results | Detected | Highest, µg/L | Reporting limit |
|---|---|---|---|---|
| HFPO-DA | 4 | 0 | < 0.005 | 0.005 |
| PFHxS | 4 | 0 | < 0.003 | 0.003 |
| PFNA | 4 | 0 | < 0.004 | 0.004 |
| PFOA | 4 | 0 | < 0.004 | 0.004 |
| PFOS | 4 | 0 | < 0.004 | 0.004 |
| lithium | 4 | 0 | < 9.0 | 9.0 |
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 Dacono, Colorado?
The City of Dacono is the public water system serving 6,900 people in Weld County, from purchased surface water. Its EPA public water system id is CO0162200.
Where does the City of Dacono get its water?
The City of Dacono reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED FROM CENTRAL WELD CO0162122.
Does the City of Dacono have any drinking water violations?
EPA's compliance record shows no open health-based violations for the City of Dacono at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Places this system serves
Census places its EPA service-area boundary substantially covers. Each page lists every system serving that place.
Every provider in Weld 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 →