PlainEnviro

Snohomish, WA

Moderate Risk (59/100)

A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.

Environmental data for Snohomish in Washington · Population: 834,648

Snohomish, WA is tracked across three EPA datasets covering 31 Toxics Release Inventory (TRI) facilities, 106 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 59/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.

Industrial disclosures inside the county total 1.2M lbs of reported toxic releases under EPCRA Section 313, while 9 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 38 and a peak AQI of 99 in 2024, with 72% of observed days rated "Good" (0–50).

All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.

Population
834,648
TRI Facilities
31
Water Systems
106
Superfund Sites
0
Total Releases
1.2M lbs

Air Quality History (2020–2024)

EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.

Year Good Moderate Unhealthy (SG) Max AQI
2024 262 (72%) 104 0 99
2023 246 (67%) 116 2 175
2022 210 (58%) 129 13 362
2021 248 (68%) 114 3 137
2020 234 (64%) 122 3 250
2024 Good Air Quality: 72% of days
Median AQI: 38

Source: EPA Air Quality System (AQS) Annual AQI by County EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)

For real-time air quality readings and pollutant breakdowns in Washington, see the EPA's AirNow.gov.

Water Systems (106)

System Population Violations
EVERETT PUBLIC WORKS DEPT. CITY OF 215,774 0
ALDERWOOD WATER DISTRICT 200,000 0
MARYSVILLE UTILITIES 88,589 0
LYNNWOOD CITY OF 68,204 0
SILVER LAKE WATER & SEWER DISTRICT 56,582 0
EDMONDS CITY OF 34,023 0
BOTHELL WATER CITY OF 33,643 0
MOUNTLAKE TERRACE CITY OF 26,402 0
Mukilteo Water & Wastewater Distr 25,182 0
MONROE WATER SYSTEM 23,467 0
CROSS VALLEY WATER DISTRICT 23,054 0
ARLINGTON CITY OF 20,418 0
OLYMPIC VIEW WATER & SEWER DISTRICT 16,403 0
STANWOOD WATER DEPT CITY OF 13,785 0
SNOHOMISH CITY OF 11,258 0
SULTAN WATER DEPARTMENT 7,160 0
GRANITE FALLS CITY OF 6,926 0
TULALIP BAY WATER DIST #1 5,968 2
SEVEN LAKES WATER ASSOCIATION 5,823 0
HIGHLAND WATER DISTRICT 3,121 0
GOLD BAR CITY OF 2,745 0
Darrington Town of 2,246 0
PORT SUSAN CAMP CLUB #1 1,500 0
PORT SUSAN CAMP CLUB #2 1,000 0
PORT SUSAN CAMP CLUB #3 1,000 2
PRIEST POINT BEACH WATER INC 624 0
MADRONA BEACH COMM WATER SYSTEM 539 4
WILKSHIRE LANE WATER DISTRICT INC 460 0
INDEX WATER DEPT 420 0
BIG BEND LANDOWNERS ASSOCIATION 419 0
HAT ISLAND COMMUNITY INC 348 0
MACHIAS RIDGE HOMEOWNERS ASSOC. 324 0
CAMANO LAGUNA VISTA WATER ASSOC 310 0
CEDAR SPRINGS CAMP 308 0
NEW UTSALADY WATER SYSTEM INC 291 0
EAGLE RIDGE 250 0
AQUA COPIA/HORSE COUNTRY ESTATES 250 0
LOCHAVEN WATER 225 0
SCHLUTER WATER ASSOCIATION 224 0
ROSELAND COMMUNITY CLUB ASSOCIATION 210 0
MOUNTAIN LOOP VIEW TRACTS 200 0
HONEYMOON LAKE 195 0
MEADOW LAKE WATER ASSOCIATION 171 0
CAMANO WEST WATER ASSOCIATION 167 0
LAKESIDE SHORES IMPROVEMENT ASSOC. 166 0
SUNSET WATER DISTRIBUTION ASSOC 159 0
FRIAR CREEK WATER SYSTEM 135 0
NORTH RIDGE WATER CORP 135 0
KATHANN ESTATES WATER 134 0
SAM LAKE IMPROVEMENT ASSOCIATION 128 0
PARKLANE WATER ASSOCIATION 127 2
GREENWATER MEADOWS LANDOWNERS ASSN 122 0
INDIAN RIDGE WATER COMPANY 120 0
WOODLAND HEIGHTS 108 0
ARLINGTON EAST MUTUAL WATER ASSN. 100 0
TYEE BEACH 2 WATER ASSOCIATION 98 0
LAKE KI SUNRISE ADDITION WATER 96 0
NEW START LANDOWNERS ASSOCIATION 90 0
PILCHUCK RIVIERA #1 90 0
OLYMPIC MARINE VIEW WATER ASSOC 89 1
MOUNTAIN VIEW TERRACE WATER INC 87 0
MADISON ESTATES 86 0
GAYS WATER DISTRICT ASSOCIATION 81 0
MERIDIAN WATER SYSTEM 81 0
SAUK-SUIATTLE 80 2
UTSALADY WATER 80 0
CAMANO SHORES COMMUNITY 79 0
CHEALCO WATER SUPPLY 78 0
Peoples Creek Water System 76 0
ARLINGTON VIEW ESTATES WATER ASSOC 75 0
THUNDERBIRD TERRACE WATER SYSTEM 75 1
TULALIP SHORES WATER SYSTEM 74 0
SNUG HARBOR MHC 71 0
NORTH HIGH ROCK ESTATES W.S. 68 0
KYAK RIDGE WATER SYSTEM 66 0
PILCHUCK 26 TRACTS 66 0
SUNNY SHORES COMMUNITY CLUB 60 0
ARLINGTON HEIGHTS WATER CO INC 57 0
PLEASANT VIEW WATER COMPANY 57 0
PALISADES ASSN 53 0
TULALIP WOOD WATER SYSTEM 52 0
FOREST GROVE MOBILE HOME PARK 51 0
OCEAN PINES PARK 50 6
TWIN ROADS WATER ASSOCIATION 50 0
ODDFELLOWS PARK 50 0
MOUNT FOREST WATER SYSTEM 50 0
BRUTUS WATER SYSTEM 48 0
RIVERSIDE WATER DIST #1 48 0
SEVENTH HEAVEN COUNTRY CLUB 48 0
PANTHER LAKE COMMUNITY WATER SYSTEM 47 0
POINT LOWELL/PARKSIDE 46 0
DELIA JIMICUM WATER DISTRICT 42 0
DARRINGTON WATER ASSOCIATION 42 0
DRIFTWOOD HEIGHTS #2 COMMUNITY ASSN 40 0
TULARE ESTATES 38 4
BUNK FOSS SYSTEM 36 0
MEADOWBROOK HOMEOWNERS ASSN 35 0
60TH STREET WATER WORKS 35 0
Lakewood Garden Tracts Water Assoc 33 0
OLYMPIC VIEW ESTATES 33 0
FERN BLUFF ESTATES 30 0
SARATOGA TERRACE WATER 30 0
MC PHERSON HILLS WATER SYSTEM 30 0
SEASCAPE WATER ASSOCIATION 28 0
GREEN VELVET WATER SYSTEM 26 0
WOODS CREEK WATER DISTRICT 25 0

TRI Facilities (31)

# Facility Total Releases
1 Boeing Commercial Airplanes - Everett 383.4K lbs
2 Cepheid - Bothell 275.2K lbs
3 Blue Streak Finishers Ltd 114.8K lbs
4 C&d Zodiac Inc 91.8K lbs
5 Fluid Motion LLC 90.9K lbs
6 Romac Industries 52.1K lbs
7 Ranger Tugs Monroe R 40.7K lbs
8 Fluid Motion LLC 36.6K lbs
9 Sr Smith LLC 31.1K lbs
10 Achilles USA Inc 17.9K lbs
11 Abw Technologies 11.1K lbs
12 US Naval Station Everett 10.6K lbs
13 Morel Industries Inc. 2.3K lbs
14 Granite Construction Co 1.3K lbs
15 Alon Asphalt Co Richmond Beach Asphalt Terminal 592 lbs
16 Romac Industries Inc 342 lbs
17 University Swaging Corp 205 lbs
18 Eldec Aerospace Corp 130 lbs
19 Seacast Marysville 55 lbs
20 Fluke Corp - Seaway 50 lbs
21 Seattle Galvanizing Co Inc 35 lbs
22 Blue Origin LLC (blue Castings) 20 lbs
23 Stella-Jones Corp 16 lbs
24 Accra Manufacturing 1 lbs
25 Cpc Materials Inc. Arlington 0 lbs
26 Connelly Skis Inc 0 lbs
27 Avtechtyee 0 lbs
28 Westlake Royal Stone LLC - Everett 0 lbs
29 Aerospace Manufacturing Technologies 0 lbs
30 Tr International Trading Co DBA Catalynt Solutions 0 lbs
31 Ad Systems 0 lbs

Cities in Snohomish (8)

Bothell
Pop: -
3 facilities · 4 water
Lynnwood
Pop: -
2 facilities · 2 water
Everett
Pop: -
9 facilities · 10 water
Arlington
Pop: -
9 facilities · 40 water
Marysville
Pop: -
2 facilities · 2 water
Monroe
Pop: -
2 facilities · 9 water
Sultan
Pop: -
1 facilities · 2 water
Edmonds
Pop: -
1 facilities · 2 water

Frequently Asked Questions

What is the environmental risk level in Snohomish, Washington? ▼
Snohomish, WA has an environmental risk score of 59/100 (Moderate Risk), based on 31 TRI facilities, 0 Superfund sites, and 106 water systems on record. 9 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Snohomish? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Snohomish, WA in the EPA database.
How many toxic release facilities are in Snohomish? ▼
Snohomish, WA has 31 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 1.2M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Snohomish? ▼
In 2024, Snohomish, WA recorded a median AQI of 38 and a peak AQI of 99. 72% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Snohomish? ▼
Snohomish, WA has 106 EPA-regulated water systems. 9 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Snohomish? ▼
Environmental compliance in Snohomish, Washington is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Washington state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

What does this county environmental profile show?

This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro Editorial