Hydrohistorian
Sans Souci Cooperative
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 | Well | Groundwater under the influence of 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.
DWR structures that name this system
Source Probable join · fetched 2026-10-06 · 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 2026-10-07 · verify at EPA ECHO ↗
3 health-based violations open now. A health-based violation means a measured level went over a federal limit, or a required treatment step was not carried out — not a missed form. What that means for anyone drinking the water depends on the contaminant and the dose; read EPA's own report and the system's Consumer Confidence Report rather than anything inferred here.
EPA's own summary: violations in 12 of the last 12 quarters, significant non-compliance in 3. In violation for, in EPA's words: 0200=Surface Water Treatment Rule; 0300=Interim Enhanced Surface Water Treatment Rule; 0700=Groundwater Rule; 0999=Chlorine; 7500=Public Notice. Currently: 0700=Groundwater Rule; 7500=Public Notice.
What happened
All 19 violation records on file, grouped into the 7 distinct things EPA's codes describe. Dates are the compliance period the violation is filed against.
Rule: Groundwater Rule -- protecting wells from faecal contamination.
Rule: Long Term 1 Enhanced Surface Water Treatment Rule.
Rule: Long Term 1 Enhanced Surface Water Treatment Rule.
Rule: Lead and Copper Rule -- corrosion of household plumbing.
Rule: Lead and Copper Rule -- corrosion of household plumbing.
Rule: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Rule: Surface Water Treatment Rule -- filtration and disinfection.
Every violation record, as filed (12 of 19)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2026-07-01 – 2026-07-31 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | known, archived | |
| 2026-07-01 – 2026-07-31 | Single Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | known, archived | |
| 2025-11-08 | Failure To Address Deficiency | Groundwater Rule | health-based | open | |
| 2025-11-08 | Failure To Address Deficiency | Groundwater Rule | health-based | open | |
| 2025-11-08 | Failure To Address Deficiency | Groundwater Rule | health-based | open | |
| 2022-12-24 | Failure To Address Deficiency | Groundwater Rule | health-based | returned to compliance (2024-07-09) | |
| 2022-06-01 – 2022-06-30 | Single Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2022-08-12) | |
| 2022-06-01 – 2022-06-30 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2022-08-12) | |
| 2020-06-01 – 2020-06-30 | Single Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2020-08-04) | |
| 2020-06-01 – 2020-06-30 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2020-08-04) | |
| 2020-05-01 – 2020-05-31 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2020-08-04) | |
| 2019-07-01 – 2019-07-31 | Monthly Turbidity Exceed (Enhanced SWTR) | Ieswtr | health-based | returned to compliance (2019-09-05) |
The remaining 7 are on the ECHO report.
What the regulator did about it
162 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 |
|---|---|---|
| 2026-08-11 | St Violation/Reminder Notice | state |
| 2026-08-11 | St Public Notif requested | state |
| 2026-08-11 | St Violation/Reminder Notice | state |
| 2026-08-11 | St Public Notif requested | state |
| 2026-06-03 | St Compliance achieved Previous RTC date was recorded as 06/19/2025. However, PN submittal from this date pertained to February 2025 BWA and not January 2025 BWA. On 6/3/26, Supplier performed EO-required PN describing failure to distribute and/or certify tier 1 for Jan 2025 BWA. KMA 7/2/26; SOX PN received late but complete FCL 6/27/2025 |
state |
| 2026-06-03 | St Compliance achieved SOX PN and COD performed and submitted in accordance with expectations FCL 6/18/2026 |
state |
| 2026-06-03 | St Compliance achieved On 6/3/26, Supplier performed EO-required PN describing failure to distribute and/or certify tier 1 for Jan 2026 BWA. KMA 7/2/26 |
state |
| 2026-05-11 | St AO (w/penalty) issued DW.05.26.107702 issued on 5/11/2026. KMA |
state |
| 2026-05-08 | St Violation/Reminder Notice | state |
| 2026-04-01 | St Violation/Reminder Notice | state |
| 2026-04-01 | St Violation/Reminder Notice | state |
| 2026-03-31 | St Compliance achieved SOX Acute PN received late FCL |
state |
| 2026-03-30 | St Violation/Reminder Notice | state |
| 2026-02-17 | St Violation/Reminder Notice | state |
| 2026-01-06 | St Violation/Reminder Notice | state |
| 2026-01-06 | St Violation/Reminder Notice | state |
| 2025-12-26 | St Compliance achieved PN/COD received FCL 1/6/2025 |
state |
| 2025-11-21 | St Violation/Reminder Notice | state |
| 2025-11-20 | St Violation/Reminder Notice | state |
| 2025-11-20 | St Public Notif requested PN schedule superseded by EO DW.05.26.1077702. KMA 5/12/26 |
state |
20 most recent of 162; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.0025 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L, below it. 14 results on file, 1 lead result over the action level all time.
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 2026-10-09 · 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).
What changed recently
Differences EPA's monthly federal record showed against the month before. A date in brackets is EPA's own; otherwise it is when this site first saw the change.
- Enforcement action: St Violation/Reminder Notice (2026-08-11)
- Enforcement action: St Public Notif requested (2026-08-11)
- Enforcement action: St Violation/Reminder Notice (2026-08-11)
- Enforcement action: St Public Notif requested (2026-08-11)
- New violation: Monthly Turbidity Exceed (Enhanced SWTR) — Ieswtr (2026-07-01)
- New violation: Single Turbidity Exceed (Enhanced SWTR) — Ieswtr (2026-07-01)
- Enforcement action: St Compliance achieved (2026-06-03)
- Enforcement action: St Compliance achieved (2026-06-03)
- New violation: Single Turbidity Exceed (Enhanced SWTR) — Ieswtr (2020-06-01)
- New violation: Monthly Turbidity Exceed (Enhanced SWTR) — Ieswtr (2020-06-01)
- New violation: Monthly Turbidity Exceed (Enhanced SWTR) — Ieswtr (2020-05-01)
- New violation: Monthly Turbidity Exceed (Enhanced SWTR) — Ieswtr (2019-07-01)
Save this system to My Water and these changes appear there each time you visit.
Common questions
Who provides drinking water in Boulder, Colorado?
Sans Souci Cooperative is the public water system serving 150 people in Boulder County, from groundwater under the influence of surface water. Its EPA public water system id is CO0107702.
Where does Sans Souci Cooperative get its water?
Sans Souci Cooperative reports groundwater under the influence of surface water as its primary source. EPA lists its source facilities as WELL.
Does Sans Souci Cooperative have any drinking water violations?
EPA's compliance record shows no open health-based violations for Sans Souci Cooperative at the last monthly fetch. Older and non-health-based entries, if any, are listed on this page.
Every provider in Boulder County.
The record
EPA SDWIS federal reporting as of 2026-10-06; the compliance record above is EPA's own, fetched monthly, and the ECHO report carries the rest. Report a problem →