Hydrohistorian
Arapahoe Water Company
Serves Arapahoe.
Modelled boundary. EPA estimated this service area (Random Forest) rather than tracing a utility-supplied map; treat the edge as approximate. About 1 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| WELL NO 1 | Well | Groundwater |
| WELL NO 2 | Well | Groundwater |
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 2026-09-09 · 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 ↗
1 violation open now, none health-based. These are monitoring, reporting or notice requirements — a sample not taken, or a result not filed on time. They are real obligations, but they are not a finding about the water itself.
EPA's own summary: violations in 12 of the last 12 quarters. In violation for, in EPA's words: 7500=Public Notice. Currently: 7500=Public Notice.
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: Public Notice Rule -- telling customers about a problem.
Every violation record, as filed (1 of 1)
| Compliance period | What | About | Kind | Status | Measured |
|---|---|---|---|---|---|
| 2019-10-17 | PN Violation without NPDWR Violation | Public Notice | other | open |
What the regulator did about it
33 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 |
|---|---|---|
| 2025-01-27 | St Compliance achieved Copy of lead consumer notice provided to LCR001 and COD certifying the notices were distributed as required 1/27/2025 received same day via portal -STF 1/27/2025 |
state |
| 2025-01-16 | St Violation/Reminder Notice | state |
| 2025-01-16 | St Public Notif requested | state |
| 2024-03-27 | St Compliance achieved | state |
| 2024-02-14 | St Violation/Reminder Notice | state |
| 2024-02-14 | St Public Notif requested | state |
| 2022-02-15 | St Compliance achieved System sampled CNO3 at both Entry Points in Jan 2022, eligible to SOX, jlm 2/15/22. |
state |
| 2022-01-28 | St Violation/Reminder Notice | state |
| 2022-01-28 | St Public Notif requested | state |
| 2022-01-28 | St Violation/Reminder Notice | state |
| 2022-01-28 | St Public Notif requested | state |
| 2021-08-03 | St Compliance achieved | state |
| 2021-08-02 | St Violation/Reminder Notice | state |
| 2021-08-02 | St Public Notif requested | state |
| 2021-01-28 | St Violation/Reminder Notice | state |
| 2019-11-22 | St Violation/Reminder Notice | state |
| 2019-11-22 | St Public Notif requested | state |
| 2019-11-22 | St Violation/Reminder Notice | state |
| 2019-11-22 | St Public Notif requested | state |
| 2019-10-26 | St Compliance achieved TC+ sample collected on 10/21/19, Department notified on Wednesday, 10/23/19, System required to collect repeat samples by Thursday, 10/24/19. System collected repeats on 10/23 and mailed them to the lab via UPS; however, lab didn't receive the results until 10/25 (outside 30 hour window) and had to invalidate the samples (samples not analyzed). Lab requested System collect again on 10/26/19, which it did, but samples are considered late. Per Pilson and Graziano, issue 34 (failure to collect trigger samples timely - 2 wells online at time of positive), MS & 27 vios, no Level 2 Assessment required, jlm 11/22/19. |
state |
20 most recent of 33; the rest are on the ECHO report.
Lead and copper
The latest 90th-percentile lead result is 0.0 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 ↗
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 Arapahoe, Colorado?
Arapahoe Water Company is the public water system serving 99 people in Cheyenne County, from groundwater. Its EPA public water system id is CO0109001.
Where does Arapahoe Water Company get its water?
Arapahoe Water Company reports groundwater as its primary source. EPA lists its source facilities as WELL NO 1, WELL NO 2.
Does Arapahoe Water Company have any drinking water violations?
EPA's compliance record shows no open health-based violations for Arapahoe Water Company 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 Cheyenne 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 →