PlainWater
States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 084690457

Long Hollow Water System

Agency Village, EPA Region 8 — Tribal Water Systems 57262 - drinking water served from groundwater sources to 265 people, tracked in EPA SDWIS and UCMR5.

265
People served
31
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 31 drinking-water violations at Long Hollow Water System.

31
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
265
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Long Hollow Water System

Long Hollow Water System is a native american-owned community water system that delivers drinking water to 265 residents in Agency Village, EPA Region 8 — Tribal Water Systems through 85 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 31 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 30 monitoring and reporting violations are on file. The most recent violation on record dates to 2009.

The most frequently cited contaminant at this system is Chromium, recorded in 3 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 8 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
265
Total Violations
31
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
85
School/Daycare
No
MCL Violations
0
Monitoring Violations
30
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chromium MR 3 1983
Selenium MR 3 1983
Mercury MR 3 1983
Barium MR 3 1983
Arsenic MR 3 1983
Coliform (TCR) MR 3 1993
Nitrate MR 3 1983
Cadmium MR 3 1983
Fluoride MR 3 1983
Chlorine MR 1 2009
Gross Alpha, Excl. Radon and U MR 1 1982
CYANIDE MR 1 1996

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Long Hollow Water System.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 084690457 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 8 — Tribal Water Systems Drinking Water Authority

EPA Region 8 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 08 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2009 Chlorine MR 1 SDWIS / 084690457 / 0999
1996 CYANIDE MR 1 SDWIS / 084690457 / 1024
1993 Coliform (TCR) MR 3 SDWIS / 084690457 / 3100
1983 Chromium MR 3 SDWIS / 084690457 / 1020
1983 Selenium MR 3 SDWIS / 084690457 / 1045
1983 Mercury MR 3 SDWIS / 084690457 / 1035
1983 Barium MR 3 SDWIS / 084690457 / 1010
1983 Arsenic MR 3 SDWIS / 084690457 / 1005
1983 Nitrate MR 3 SDWIS / 084690457 / 1040
1983 Cadmium MR 3 SDWIS / 084690457 / 1015
1983 Fluoride MR 3 SDWIS / 084690457 / 1025
1982 Gross Alpha, Excl. Radon and U MR 1 SDWIS / 084690457 / 4000

How Long Hollow Water System Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Long Hollow Water System EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 31 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 265 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 8 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Long Hollow Water System water safe to drink? ▼
Long Hollow Water System (PWS ID: 084690457) has 31 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 265 people using Groundwater sources.
How many people does Long Hollow Water System serve? ▼
Long Hollow Water System serves 265 people in Agency Village, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 85 service connections.
What type of violations does Long Hollow Water System have? ▼
Long Hollow Water System has 31 total violations: 0 health-based violations (MCL exceedances or treatment failures), 30 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Long Hollow Water System water? ▼
No PFAS testing data is available for Long Hollow Water System under the EPA's UCMR5 monitoring program.
What water source does Long Hollow Water System use? ▼
Long Hollow Water System uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.