PlainWater
States → Oregon

DIAMOND RIDGE WATER ASSOCIATION

PWS ID: OR4106138 · EUGENE, Oregon 97402

DIAMOND RIDGE WATER ASSOCIATION serves 54 people in EUGENE, Oregon using Groundwater water sources. It has 114 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: DIAMOND RIDGE WATER ASSOCIATION

DIAMOND RIDGE WATER ASSOCIATION is a private-owned community water system that delivers drinking water to 54 residents in EUGENE, Oregon (Lane County) through 25 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 114 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 114 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 4 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. DIAMOND RIDGE WATER ASSOCIATION's 114 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
54
Total Violations
114
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
25
County
Lane
School/Daycare
No
MCL Violations
0
Monitoring Violations
114
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 4 2014
TTHM MR 2 2010
Total Haloacetic Acids (HAA5) MR 2 2010
Lead and Copper Rule MR 2 2011
Xylenes, Total MR 2 2010
Vinyl chloride MR 2 2010
1,1-Dichloroethylene MR 2 2010
1,2-Dichloroethane MR 2 2010
1,1,1-Trichloroethane MR 2 2010
1,1,2-Trichloroethane MR 2 2010
Tetrachloroethylene MR 2 2010
Benzene MR 2 2010
Ethylbenzene MR 2 2010
Styrene MR 2 2010
Endrin MR 2 2010
Diquat MR 2 2010
Glyphosate MR 2 2010
Di(2-ethylhexyl) adipate MR 2 2010
Carbofuran MR 2 2010
Heptachlor MR 2 2010
Heptachlor epoxide MR 2 2010
2,4,5-TP MR 2 2010
Pentachlorophenol MR 2 2010
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2010
Chlordane MR 2 2010
BHC-GAMMA MR 2 2010
trans-1,2-Dichloroethylene MR 2 2010
Simazine MR 2 2010
Toxaphene MR 2 2010
1,2,4-Trichlorobenzene MR 2 2010

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 DIAMOND RIDGE 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 OR4106138 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
2016 Combined Radium (-226 and -228) MR 1 SDWIS / OR4106138 / 4010
2016 Gross Alpha, Excl. Radon and U MR 1 SDWIS / OR4106138 / 4000
2014 Coliform (TCR) MR 4 SDWIS / OR4106138 / 3100
2012 COLIPHAGE MR 2 SDWIS / OR4106138 / 3028
2011 Lead and Copper Rule MR 2 SDWIS / OR4106138 / 5000
2010 TTHM MR 2 SDWIS / OR4106138 / 2950
2010 Total Haloacetic Acids (HAA5) MR 2 SDWIS / OR4106138 / 2456
2010 Xylenes, Total MR 2 SDWIS / OR4106138 / 2955
2010 Vinyl chloride MR 2 SDWIS / OR4106138 / 2976
2010 1,1-Dichloroethylene MR 2 SDWIS / OR4106138 / 2977
2010 1,2-Dichloroethane MR 2 SDWIS / OR4106138 / 2980
2010 1,1,1-Trichloroethane MR 2 SDWIS / OR4106138 / 2981
2010 1,1,2-Trichloroethane MR 2 SDWIS / OR4106138 / 2985
2010 Tetrachloroethylene MR 2 SDWIS / OR4106138 / 2987
2010 Benzene MR 2 SDWIS / OR4106138 / 2990

How DIAMOND RIDGE WATER ASSOCIATION Compares

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

Metric DIAMOND RIDGE WATER ASSOCIATION Oregon avg Federal benchmark
Total violations 114 82.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 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 54 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 DIAMOND RIDGE WATER ASSOCIATION water safe to drink? ▼
DIAMOND RIDGE WATER ASSOCIATION (PWS ID: OR4106138) has 114 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 54 people using Groundwater sources.
How many people does DIAMOND RIDGE WATER ASSOCIATION serve? ▼
DIAMOND RIDGE WATER ASSOCIATION serves 54 people in EUGENE, Oregon. It is a Private-owned system using Groundwater water sources with 25 service connections.
What type of violations does DIAMOND RIDGE WATER ASSOCIATION have? ▼
DIAMOND RIDGE WATER ASSOCIATION has 114 total violations: 0 health-based violations (MCL exceedances or treatment failures), 114 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in DIAMOND RIDGE WATER ASSOCIATION water? ▼
No PFAS testing data is available for DIAMOND RIDGE WATER ASSOCIATION under the EPA's UCMR5 monitoring program.
What water source does DIAMOND RIDGE WATER ASSOCIATION use? ▼
DIAMOND RIDGE WATER ASSOCIATION 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.

Explore PlainWater

Water in Oregon

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for Oregon

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
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.

Related

Browse all → | Rankings →
Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial