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SISTERS, CITY OF

PWS ID: OR4100826 · SISTERS, Oregon 97759

SISTERS, CITY OF serves 3,778 people in SISTERS, Oregon using Groundwater water sources. It has 124 recorded EPA violations, including 2 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SISTERS, CITY OF

SISTERS, CITY OF is a local-owned community water system that delivers drinking water to 3,778 residents in SISTERS, Oregon (Deschutes County) through 2,200 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 124 total violations for this system , of which 2 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 120 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 24 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Oregon, EPA tracks 2,518 public water systems serving 4,005,242 people, with 206,659 cumulative violations and 20,339 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 82.1 violations. SISTERS, CITY OF's 124 violations sit above the Oregon average. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%). 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
3,778
Total Violations
124
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,200
County
Deschutes
School/Daycare
No
MCL Violations
0
Monitoring Violations
120
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 24 1996
Coliform (TCR) MR 3 2015
Surface Water Treatment Rule TT 2 1992
Endrin MR 2 2009
BHC-GAMMA MR 2 2009
Toxaphene MR 2 2009
Dalapon MR 2 2009
Endothall MR 2 2009
Glyphosate MR 2 2009
Simazine MR 2 2009
Picloram MR 2 2009
Carbofuran MR 2 2009
Atrazine MR 2 2009
Heptachlor MR 2 2009
Heptachlor epoxide MR 2 2009
2,4,5-TP MR 2 2009
Benzo(a)pyrene MR 2 2009
Chlordane MR 2 2009
Di(2-ethylhexyl) adipate MR 2 2009
Dinoseb MR 2 2009
Hexachlorocyclopentadiene MR 2 2009
LASSO MR 2 2009
2,4-D MR 2 2009
Pentachlorophenol MR 2 2009
Total Polychlorinated Biphenyls (PCB) MR 2 2009
COLIPHAGE MR 2 2012
Diquat MR 2 2009
Di(2-ethylhexyl) phthalate MR 2 2009
HEXACHLOROBENZENE MR 2 2009
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2009

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 SISTERS, CITY OF.

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 OR4100826 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oregon Drinking Water Authority

Oregon'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 OR 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
2015 Coliform (TCR) MR 3 SDWIS / OR4100826 / 3100
2012 COLIPHAGE MR 2 SDWIS / OR4100826 / 3028
2009 Endrin MR 2 SDWIS / OR4100826 / 2005
2009 BHC-GAMMA MR 2 SDWIS / OR4100826 / 2010
2009 Toxaphene MR 2 SDWIS / OR4100826 / 2020
2009 Dalapon MR 2 SDWIS / OR4100826 / 2031
2009 Endothall MR 2 SDWIS / OR4100826 / 2033
2009 Glyphosate MR 2 SDWIS / OR4100826 / 2034
2009 Simazine MR 2 SDWIS / OR4100826 / 2037
2009 Picloram MR 2 SDWIS / OR4100826 / 2040
2009 Carbofuran MR 2 SDWIS / OR4100826 / 2046
2009 Atrazine MR 2 SDWIS / OR4100826 / 2050
2009 Heptachlor MR 2 SDWIS / OR4100826 / 2065
2009 Heptachlor epoxide MR 2 SDWIS / OR4100826 / 2067
2009 2,4,5-TP MR 2 SDWIS / OR4100826 / 2110

How SISTERS, CITY OF Compares

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

Metric SISTERS, CITY OF Oregon avg Federal benchmark
Total violations 124 82.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 2 8.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 24% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,778 1,591 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,518 regulated public water systems in Oregon.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is SISTERS, CITY OF water safe to drink? ▼
SISTERS, CITY OF (PWS ID: OR4100826) has 124 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,778 people using Groundwater sources.
How many people does SISTERS, CITY OF serve? ▼
SISTERS, CITY OF serves 3,778 people in SISTERS, Oregon. It is a Local-owned system using Groundwater water sources with 2,200 service connections.
What type of violations does SISTERS, CITY OF have? ▼
SISTERS, CITY OF has 124 total violations: 2 health-based violations (MCL exceedances or treatment failures), 120 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SISTERS, CITY OF water? ▼
No PFAS testing data is available for SISTERS, CITY OF under the EPA's UCMR5 monitoring program.
What water source does SISTERS, CITY OF use? ▼
SISTERS, CITY OF 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.

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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.

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