Hydrohistorian
Town of Ault
Serves Ault.
Boundary traced from IRE. About 10 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| PURCHASED NORTH WELD COUNTY WD 162553 SW | Consecutive connection (purchased) | Surface water · from NORTH WELD COUNTY 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 NORTH WELD COUNTY WD.
Sells water to 1 system: STEWARTS MOBILE HOME PARK.
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 5 of the last 12 quarters. In violation for, in EPA's words: 2456=Total Haloacetic Acids (HAA5); 2950=TTHM.
No health-based or open violation on the federal record for this system.
What the regulator did about it
15 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 |
|---|---|---|
| 2025-02-24 | St Compliance achieved SOX DBP samples reported in accordance with the rule 1Q 2025 FCL 4/22/2025 |
state |
| 2025-01-17 | St Violation/Reminder Notice | state |
| 2025-01-17 | St Public Notif requested | state |
| 2024-06-27 | St Compliance achieved SOX CCR/COD performed in accordance with the rule FCL 6/27/2024 |
state |
| 2023-07-18 | St Violation/Reminder Notice | state |
| 2023-07-18 | St Public Notif requested | state |
| 2022-07-12 | St Compliance achieved CCR submitted after violation was issued. Closing with date CCR was received. LAC 7/12/2022 |
state |
| 2022-07-11 | St Violation/Reminder Notice | state |
| 2022-07-11 | St Public Notif requested | state |
| 2021-09-14 | St Compliance achieved | state |
| 2021-05-25 | St Violation/Reminder Notice | state |
| 2021-05-25 | St Public Notif requested | state |
| 2019-08-23 | St Compliance achieved COD and notice sent in on 8/23/2019. LAC 2/10/2020 |
state |
| 2019-01-14 | St Violation/Reminder Notice | state |
| 2019-01-14 | St Public Notif requested | state |
Lead and copper
The latest 90th-percentile lead result is 0.0013 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 6 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 Ault, Colorado?
The Town of Ault is the public water system serving 4,220 people in Weld County, from purchased surface water. Its EPA public water system id is CO0162125.
Where does the Town of Ault get its water?
The Town of Ault reports purchased surface water as its primary source. EPA lists its source facilities as PURCHASED NORTH WELD COUNTY WD 162553 SW.
Does the Town of Ault have any drinking water violations?
EPA's compliance record shows no open health-based violations for the Town of Ault 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 →