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INDEX WATER DEPT

PWS ID: WA5335600 · INDEX, Washington 98256

INDEX WATER DEPT serves 420 people in INDEX, Washington using Groundwater water sources. It has 130 recorded EPA violations, including 18 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: INDEX WATER DEPT

INDEX WATER DEPT is a local-owned community water system that delivers drinking water to 420 residents in INDEX, Washington (Snohomish County) through 129 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 130 total violations for this system , of which 18 (14%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 110 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 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 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. INDEX WATER DEPT's 130 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
420
Total Violations
130
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
129
County
Snohomish
School/Daycare
No
MCL Violations
18
Monitoring Violations
110
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 18 1998
Nitrate MR 14 2013
Lead and Copper Rule MR 13 2022
Coliform (TCR) MR 4 2000
Barium MR 3 2005
Chromium MR 3 2005
Fluoride MR 3 2005
Mercury MR 3 2005
Selenium MR 3 2005
Arsenic MR 3 2005
Cadmium MR 3 2005
Nickel MR 2 2005
Antimony, Total MR 2 2005
cis-1,2-Dichloroethylene MR 2 2017
o-Dichlorobenzene MR 2 2017
1,1-Dichloroethylene MR 2 2017
1,2-Dichloroethane MR 2 2017
Carbon tetrachloride MR 2 2017
CHLOROBENZENE MR 2 2017
Benzene MR 2 2017
Ethylbenzene MR 2 2017
p-Dichlorobenzene MR 2 2017
trans-1,2-Dichloroethylene MR 2 2017
1,1,1-Trichloroethane MR 2 2017
Toluene MR 2 2017
Revised Total Coliform Rule MON 2 2024
Thallium, Total MR 2 2005
Trichloroethylene MR 2 2017
Styrene MR 2 2017
Tetrachloroethylene MR 2 2017

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 INDEX WATER DEPT.

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 WA5335600 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 INDEX WATER DEPT 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
2024 Revised Total Coliform Rule MON 2 SDWIS / WA5335600 / 8000
2024 Consumer Confidence Rule Other 1 SDWIS / WA5335600 / 7000
2022 Lead and Copper Rule MR 13 SDWIS / WA5335600 / 5000
2017 cis-1,2-Dichloroethylene MR 2 SDWIS / WA5335600 / 2380
2017 o-Dichlorobenzene MR 2 SDWIS / WA5335600 / 2968
2017 1,1-Dichloroethylene MR 2 SDWIS / WA5335600 / 2977
2017 1,2-Dichloroethane MR 2 SDWIS / WA5335600 / 2980
2017 Carbon tetrachloride MR 2 SDWIS / WA5335600 / 2982
2017 CHLOROBENZENE MR 2 SDWIS / WA5335600 / 2989
2017 Benzene MR 2 SDWIS / WA5335600 / 2990
2017 Ethylbenzene MR 2 SDWIS / WA5335600 / 2992
2017 p-Dichlorobenzene MR 2 SDWIS / WA5335600 / 2969
2017 trans-1,2-Dichloroethylene MR 2 SDWIS / WA5335600 / 2979
2017 1,1,1-Trichloroethane MR 2 SDWIS / WA5335600 / 2981
2017 Toluene MR 2 SDWIS / WA5335600 / 2991

How INDEX WATER DEPT Compares

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

Metric INDEX WATER DEPT Washington avg Federal benchmark
Total violations 130 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 18 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 420 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 INDEX WATER DEPT water safe to drink? ▼
INDEX WATER DEPT (PWS ID: WA5335600) has 130 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 420 people using Groundwater sources.
How many people does INDEX WATER DEPT serve? ▼
INDEX WATER DEPT serves 420 people in INDEX, Washington. It is a Local-owned system using Groundwater water sources with 129 service connections.
What type of violations does INDEX WATER DEPT have? ▼
INDEX WATER DEPT has 130 total violations: 18 health-based violations (MCL exceedances or treatment failures), 110 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in INDEX WATER DEPT water? ▼
No PFAS testing data is available for INDEX WATER DEPT under the EPA's UCMR5 monitoring program.
What water source does INDEX WATER DEPT use? ▼
INDEX WATER DEPT 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.

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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.

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