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States → Oregon

Community Water System · PWS OR4100238

Lamontai Improvement Wtr Dist

Cottage Grove, Oregon 97424 - drinking water served from groundwater sources to 255 people, tracked in EPA SDWIS and UCMR5.

255
People served
67
EPA violations
20
Health-based
Untested
UCMR5 result

The verdict

EPA records 67 drinking-water violations at Lamontai Improvement Wtr Dist, 30% of them health-based - below the Oregon per-system average.

67
Total EPA violations on record
30%
Health-based (MCL / treatment failure)
255
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lamontai Improvement Wtr Dist

Lamontai Improvement Wtr Dist is a local-owned community water system that delivers drinking water to 255 residents in Cottage Grove, Oregon (Lane County) through 98 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 67 total violations for this system , of which 20 (30%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 37 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 20 violations (MCL, health-based). 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%).

Lamontai Improvement Wtr Dist's 67 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
255
Total Violations
67
Health-Based Violations
20
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
98
County
Lane
School/Daycare
No
MCL Violations
20
Monitoring Violations
37
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 20 2005
Coliform (TCR) MR 18 2009
COLIPHAGE MR 8 2012
Nitrate MR 4 1999
Gross Alpha, Excl. Radon and U MR 2 2017
Lead and Copper Rule MR 2 2023
Combined Radium (-226 and -228) MR 2 2017
Combined Uranium MR 1 2017
Consumer Confidence Rule Other 1 2023

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 Lamontai Improvement Wtr Dist.

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 OR4100238 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 Lead and Copper Rule MR 2 SDWIS / OR4100238 / 5000
2023 Consumer Confidence Rule Other 1 SDWIS / OR4100238 / 7000
2017 Gross Alpha, Excl. Radon and U MR 2 SDWIS / OR4100238 / 4000
2017 Combined Radium (-226 and -228) MR 2 SDWIS / OR4100238 / 4010
2017 Combined Uranium MR 1 SDWIS / OR4100238 / 4006
2012 COLIPHAGE MR 8 SDWIS / OR4100238 / 3028
2009 Coliform (TCR) MR 18 SDWIS / OR4100238 / 3100
2005 Coliform (TCR) MCL 20 SDWIS / OR4100238 / 3100
1999 Nitrate MR 4 SDWIS / OR4100238 / 1040

How Lamontai Improvement Wtr Dist Compares

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

Metric Lamontai Improvement Wtr Dist Oregon avg Federal benchmark
Total violations 67 82.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 20 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 255 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 Lamontai Improvement Wtr Dist water safe to drink? ▼
Lamontai Improvement Wtr Dist (PWS ID: OR4100238) has 67 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 255 people using Groundwater sources.
How many people does Lamontai Improvement Wtr Dist serve? ▼
Lamontai Improvement Wtr Dist serves 255 people in Cottage Grove, Oregon. It is a Local-owned system using Groundwater water sources with 98 service connections.
What type of violations does Lamontai Improvement Wtr Dist have? ▼
Lamontai Improvement Wtr Dist has 67 total violations: 20 health-based violations (MCL exceedances or treatment failures), 37 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lamontai Improvement Wtr Dist water? ▼
No PFAS testing data is available for Lamontai Improvement Wtr Dist under the EPA's UCMR5 monitoring program.
What water source does Lamontai Improvement Wtr Dist use? ▼
Lamontai Improvement Wtr Dist 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.