PlainWater
States → Washington

Winlock Fibre LLC

PWS ID: WA5306991 · Napavine, Washington 98565

Winlock Fibre LLC serves 34 people in Napavine, Washington using Groundwater water sources. It has 761 recorded EPA violations, including 1 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: Winlock Fibre LLC

Winlock Fibre LLC is a private-owned non-transient non-community water system that delivers drinking water to 34 residents in Napavine, Washington (Lewis County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 761 total violations for this system , of which 1 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 760 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 Aldicarb sulfoxide, recorded in 40 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 Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Winlock Fibre LLC's 761 violations sit above the Washington average. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%). 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
34
Total Violations
761
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
2
County
Lewis
School/Daycare
No
MCL Violations
0
Monitoring Violations
760
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Aldicarb sulfoxide MR 40 2007
Aldicarb sulfone MR 40 2007
OXAMYL MR 40 2007
Carbofuran MR 40 2007
Aldicarb MR 40 2007
Pentachlorophenol MR 25 2013
Lead and Copper Rule MR 23 2013
Revised Total Coliform Rule MON 16 2019
Picloram MR 13 2013
2,4,5-TP MR 13 2013
Nitrate MR 13 2018
Dalapon MR 13 2013
Dinoseb MR 13 2013
cis-1,2-Dichloroethylene MR 12 2007
DICHLOROMETHANE MR 12 2007
trans-1,2-Dichloroethylene MR 12 2007
1,2-Dichloropropane MR 12 2007
Trichloroethylene MR 12 2007
1,1,2-Trichloroethane MR 12 2007
Tetrachloroethylene MR 12 2007
CHLOROBENZENE MR 12 2007
Toluene MR 12 2007
Styrene MR 12 2007
Endrin MR 12 2007
Toxaphene MR 12 2007
Di(2-ethylhexyl) adipate MR 12 2007
Di(2-ethylhexyl) phthalate MR 12 2007
Atrazine MR 12 2007
LASSO MR 12 2007
Heptachlor MR 12 2007

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 Winlock Fibre LLC.

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 WA5306991 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health — Office of Drinking Water is the primacy agency that licenses and inspects Winlock Fibre LLC under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health — Office of Drinking Water

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 TT 1 SDWIS / WA5306991 / 5000
2019 Revised Total Coliform Rule MON 16 SDWIS / WA5306991 / 8000
2018 Nitrate MR 13 SDWIS / WA5306991 / 1040
2013 Pentachlorophenol MR 25 SDWIS / WA5306991 / 2326
2013 Lead and Copper Rule MR 23 SDWIS / WA5306991 / 5000
2013 Picloram MR 13 SDWIS / WA5306991 / 2040
2013 2,4,5-TP MR 13 SDWIS / WA5306991 / 2110
2013 Dalapon MR 13 SDWIS / WA5306991 / 2031
2013 Dinoseb MR 13 SDWIS / WA5306991 / 2041
2012 Coliform (TCR) MR 11 SDWIS / WA5306991 / 3100
2007 Aldicarb sulfoxide MR 40 SDWIS / WA5306991 / 2043
2007 Aldicarb sulfone MR 40 SDWIS / WA5306991 / 2044
2007 OXAMYL MR 40 SDWIS / WA5306991 / 2036
2007 Carbofuran MR 40 SDWIS / WA5306991 / 2046
2007 Aldicarb MR 40 SDWIS / WA5306991 / 2047

How Winlock Fibre LLC Compares

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

Metric Winlock Fibre LLC Washington avg Federal benchmark
Total violations 761 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 1 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 34 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

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 Winlock Fibre LLC water safe to drink? ▼
Winlock Fibre LLC (PWS ID: WA5306991) has 761 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 34 people using Groundwater sources.
How many people does Winlock Fibre LLC serve? ▼
Winlock Fibre LLC serves 34 people in Napavine, Washington. It is a Private-owned system using Groundwater water sources with 2 service connections.
What type of violations does Winlock Fibre LLC have? ▼
Winlock Fibre LLC has 761 total violations: 1 health-based violations (MCL exceedances or treatment failures), 760 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Winlock Fibre LLC water? ▼
No PFAS testing data is available for Winlock Fibre LLC under the EPA's UCMR5 monitoring program.
What water source does Winlock Fibre LLC use? ▼
Winlock Fibre LLC uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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 Washington

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for Washington

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