Water Quality in Lummi Island, WA: 11 Violations - Grade A
Grade A · Score 85/100 · 4 water systems · Updated 2026-07-18
Lummi Island's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Lummi Island, WA has 11 violations in the EPA compliance history - breakdown below.
Water Quality by ZIP Code in Lummi Island
Lummi Island is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 98262 | A | 85 | 11 | 4 | View report → |
Violation Trend
EPA violations recorded for water systems serving Lummi Island.
Water Quality Overview
Lummi Island, Washington receives a water quality grade of A with an overall score of 85 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 4 water systems serving Lummi Island have accumulated 11 EPA violations, including 4 health-based violations. These violations are tracked across 1 ZIP code serving approximately 1,020 people.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Lummi Island's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across Lummi Island water systems is 0.0018 mg/L - within EPA limits. No ZIP codes exceed the EPA lead action level.
With 66% of homes built before 1986, Lummi Island has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Lummi Island
Lummi Island is served by 4 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 1,020 people across 1 ZIP code.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Lummi Island. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Lummi Island
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Lummi Island Water Systems
The following contaminants have been detected or caused violations across Lummi Island's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | N/A | 4 | 1 | No |
| Fecal Coliform | Microbiological | N/A | 3 | 1 | Yes |
| E. coli | Microbiological | N/A | 2 | 1 | Yes |
| Lead | Inorganic | 0.015 mg/L | 1 | 1 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Lummi Island:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 3 | 3 |
| 2024 | 3 | 3 |
| 2025 | 3 | 3 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Lummi Island. Recent actions:
| Date | Action Type |
|---|---|
| 2026-01-15 | State Order Extension |
| 2025-11-14 | State Informal Action |
| 2025-09-29 | State Order Extension |
| 2025-08-31 | State Order Extension |
| 2024-11-26 | State Filed Suit |
| 2024-09-30 | State Order Extension |
| 2024-06-20 | State Order Extension |
| 2023-09-27 | State Order Extension |
| 2023-09-19 | State Order Extension |
| 2023-09-01 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-01-15.
Lummi Island vs. Nearby Washington Cities
How Lummi Island's water quality compares to similar cities in Washington:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Lummi Island | A | 11 | 4 | 1,020 |
| Sprague | B | 6 | 1 | 1,022 |
| Rosalia | B | 3 | 2 | 1,015 |
| Cowiche | C | 0 | 1 | 1,027 |
Common Questions About Lummi Island Water
These are the most common questions residents search for about water quality in Lummi Island, Washington:
Is Lummi Island water hard or soft? Water hardness varies by source. Lummi Island's 4 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Lummi Island tap water? Lummi Island's water receives a grade of A (85/100). There are 4 health-based violations - consider filtration.
What is the best water filter for Lummi Island? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Lummi Island vs. Washington Average
Understanding how Lummi Island compares to the broader Washington average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Lummi Island.
ZIP Codes in Lummi Island
Lummi Island spans 1 ZIP code. The ZIP with the lowest water quality score is 98262. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.
Frequently Asked Questions
Your Water is Safe - Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.