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Community Water System · PWS OR4100705

South Umpqua Water Association

Riddle, Oregon 97469 - drinking water served from surface water sources to 575 people, tracked in EPA SDWIS and UCMR5.

575
People served
32
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 32 drinking-water violations at South Umpqua Water Association, 3% of them health-based - below the Oregon per-system average.

32
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
575
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: South Umpqua Water Association

South Umpqua Water Association is a private-owned community water system that delivers drinking water to 575 residents in Riddle, Oregon (Douglas County) through 287 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 32 total violations for this system , of which 1 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 26 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 17 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. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%).

South Umpqua Water Association's 32 violations sit below the Oregon average.

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
575
Total Violations
32
Health-Based Violations
1
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
287
County
Douglas
School/Daycare
No
MCL Violations
1
Monitoring Violations
26
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 17 2012
Consumer Confidence Rule Other 4 2023
Total Haloacetic Acids (HAA5) MR 4 2015
TTHM MR 4 2015
Coliform (TCR) MCL 1 1992
Revised Total Coliform Rule MON 1 2025

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 South Umpqua Water Association.

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 OR4100705 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
2025 Revised Total Coliform Rule MON 1 SDWIS / OR4100705 / 8000
2023 Consumer Confidence Rule Other 4 SDWIS / OR4100705 / 7000
2015 Total Haloacetic Acids (HAA5) MR 4 SDWIS / OR4100705 / 2456
2015 TTHM MR 4 SDWIS / OR4100705 / 2950
2012 Coliform (TCR) MR 17 SDWIS / OR4100705 / 3100
1992 Coliform (TCR) MCL 1 SDWIS / OR4100705 / 3100

How South Umpqua Water Association Compares

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

Metric South Umpqua Water Association Oregon avg Federal benchmark
Total violations 32 82.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 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 575 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 (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 South Umpqua Water Association water safe to drink? ▼
South Umpqua Water Association (PWS ID: OR4100705) has 32 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 575 people using Surface Water sources.
How many people does South Umpqua Water Association serve? ▼
South Umpqua Water Association serves 575 people in Riddle, Oregon. It is a Private-owned system using Surface Water water sources with 287 service connections.
What type of violations does South Umpqua Water Association have? ▼
South Umpqua Water Association has 32 total violations: 1 health-based violations (MCL exceedances or treatment failures), 26 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in South Umpqua Water Association water? ▼
No PFAS testing data is available for South Umpqua Water Association under the EPA's UCMR5 monitoring program.
What water source does South Umpqua Water Association use? ▼
South Umpqua Water Association uses Surface Water 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.