PlainWater
States → Oregon

RAINBOW ENDS WATER SYSTEM

PWS ID: OR4101350 · HILLSBORO, Oregon 97123

RAINBOW ENDS WATER SYSTEM serves 50 people in HILLSBORO, Oregon using Groundwater water sources. It has 120 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: RAINBOW ENDS WATER SYSTEM

RAINBOW ENDS WATER SYSTEM is a private-owned community water system that delivers drinking water to 50 residents in HILLSBORO, Oregon (Washington County) through 19 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 120 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 108 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 37 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. RAINBOW ENDS WATER SYSTEM's 120 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
50
Total Violations
120
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
19
County
Washington
School/Daycare
No
MCL Violations
0
Monitoring Violations
108
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 37 1996
Lead and Copper Rule MR 3 1994
BHC-GAMMA MR 2 2005
Diquat MR 2 2005
OXAMYL MR 2 2005
TTHM MR 2 2009
COLIPHAGE MR 2 2012
Total Haloacetic Acids (HAA5) MR 2 2009
Di(2-ethylhexyl) phthalate MR 2 2005
Dinoseb MR 2 2005
Heptachlor epoxide MR 2 2005
LASSO MR 2 2005
Carbofuran MR 2 2005
Glyphosate MR 2 2005
Toxaphene MR 2 2005
Arsenic MR 1 2002
Methoxychlor MR 1 2005
Dalapon MR 1 2005
Di(2-ethylhexyl) adipate MR 1 2005
Hexachlorocyclopentadiene MR 1 2005
Atrazine MR 1 2005
2,4-D MR 1 2005
HEXACHLOROBENZENE MR 1 2005
Benzo(a)pyrene MR 1 2005
Total Polychlorinated Biphenyls (PCB) MR 1 2005
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2005
ETHYLENE DIBROMIDE MR 1 2005
1,2,4-Trichlorobenzene MR 1 2005
cis-1,2-Dichloroethylene MR 1 2005
Xylenes, Total MR 1 2005

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 RAINBOW ENDS 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 OR4101350 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
2023 Consumer Confidence Rule Other 1 SDWIS / OR4101350 / 7000
2014 Combined Radium (-226 and -228) MR 1 SDWIS / OR4101350 / 4010
2012 COLIPHAGE MR 2 SDWIS / OR4101350 / 3028
2009 TTHM MR 2 SDWIS / OR4101350 / 2950
2009 Total Haloacetic Acids (HAA5) MR 2 SDWIS / OR4101350 / 2456
2005 BHC-GAMMA MR 2 SDWIS / OR4101350 / 2010
2005 Diquat MR 2 SDWIS / OR4101350 / 2032
2005 OXAMYL MR 2 SDWIS / OR4101350 / 2036
2005 Di(2-ethylhexyl) phthalate MR 2 SDWIS / OR4101350 / 2039
2005 Dinoseb MR 2 SDWIS / OR4101350 / 2041
2005 Heptachlor epoxide MR 2 SDWIS / OR4101350 / 2067
2005 LASSO MR 2 SDWIS / OR4101350 / 2051
2005 Carbofuran MR 2 SDWIS / OR4101350 / 2046
2005 Glyphosate MR 2 SDWIS / OR4101350 / 2034
2005 Toxaphene MR 2 SDWIS / OR4101350 / 2020

How RAINBOW ENDS WATER SYSTEM Compares

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

Metric RAINBOW ENDS WATER SYSTEM Oregon avg Federal benchmark
Total violations 120 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 50 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 RAINBOW ENDS WATER SYSTEM water safe to drink? ▼
RAINBOW ENDS WATER SYSTEM (PWS ID: OR4101350) has 120 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 50 people using Groundwater sources.
How many people does RAINBOW ENDS WATER SYSTEM serve? ▼
RAINBOW ENDS WATER SYSTEM serves 50 people in HILLSBORO, Oregon. It is a Private-owned system using Groundwater water sources with 19 service connections.
What type of violations does RAINBOW ENDS WATER SYSTEM have? ▼
RAINBOW ENDS WATER SYSTEM has 120 total violations: 0 health-based violations (MCL exceedances or treatment failures), 108 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in RAINBOW ENDS WATER SYSTEM water? ▼
No PFAS testing data is available for RAINBOW ENDS WATER SYSTEM under the EPA's UCMR5 monitoring program.
What water source does RAINBOW ENDS WATER SYSTEM use? ▼
RAINBOW ENDS 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.

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