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Pima, AZ

High Risk (71/100)

Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.

Environmental data for Pima in Arizona · Population: 1,049,947

TRI sites such as Asarco LLC Mission Complex; Freeport-McMoran Sierrita Inc; Fluidra; SDWIS systems such as METROPOLITAN DWID; ORO VALLEY WATER UTILITY; COMMUNITY WC OF GREEN VALLEY; NPL sites such as Tucson International Airport Area anchor Pima, AZ's EPA extract. Derived burden score 71/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.

EPCRA disclosures in Pima total 27.4M lbs; health-flagged SDWIS rows include ORO VALLEY WATER UTILITY; FLOWING WELLS IRRIGATION DISTRICT; ADOC TUCSON, while Asarco LLC Mission Complex leads TRI pounds. AQS median AQI 56 / peak 171 in 2024.

Largest TRI sites in the extract: Asarco LLC Mission Complex; Freeport-McMoran Sierrita Inc; Fluidra. Named SDWIS systems: METROPOLITAN DWID; ORO VALLEY WATER UTILITY; COMMUNITY WC OF GREEN VALLEY. NPL sites on record: Tucson International Airport Area. Burden score 71/100 (High Risk) is the only weighted composite here; tables reproduce EPA disclosure history, not a current-safety verdict.

Release-over-release change

What changed for Pima, AZ: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

-44.4%

28 facilities that filed in 2022 and 2023

Whole inventory

-44.3%

8.7 million lb → 4.8 million lb, every facility that filed

Between the two reporting years, 2 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.

  • Pima, AZ's total reported releases fell from 8.7 million lb in 2022 to 4.8 million lb in 2023, based on EPA TRI filings.
  • Pima, AZ's water releases fell from 210 lb in 2022 to 2 lb in 2023, based on EPA TRI filings.
  • Pima, AZ's land releases fell from 8.6 million lb in 2022 to 4.7 million lb in 2023, based on EPA TRI filings.
  • Pima, AZ's air releases rose from 71.5 thousand lb in 2022 to 87.5 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
1,049,947
TRI Facilities
35
Water Systems
120
Superfund Sites
1
Total Releases
27.4M 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 113 (31%) 241 10 171
2023 123 (34%) 235 7 147
2022 147 (40%) 205 13 142
2021 93 (25%) 258 13 313
2020 124 (34%) 229 12 277
2024 Good Air Quality: 31% of days
Unhealthy days: 12
Median AQI: 56

Source: 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 Arizona, see the EPA's AirNow.gov.

Water Systems (120)

System System pop (SDWIS) Violations
METROPOLITAN DWID 45,570 0
ORO VALLEY WATER UTILITY 42,316 2
COMMUNITY WC OF GREEN VALLEY 22,085 0
USAF DAVIS MONTHAN AFB 18,640 0
SAHUARITA WATER COMPANY 18,178 0
VAIL WATER COMPANY 17,500 0
FLOWING WELLS IRRIGATION DISTRICT 16,000 3
MARANA MUNICIPAL - MARANA 15,162 0
GREEN VALLEY DWID 8,687 0
AVRA WATER COOP INC 6,685 0
METROPOLITAN DWID - DIABLO VILLAGE 5,542 0
MARANA MUNICIPAL - PICTURE ROCKS 5,278 0
MARANA MUNICIPAL - HARTMAN VISTAS 5,248 0
MARANA MUNICIPAL - AIRLINE LAMBERT 4,568 0
ORO VALLEY WATER COUNTRYSIDE 4,534 0
ADOC TUCSON 4,500 1
METROPOLITAN DWID - HUB 4,252 0
Sells Intertie 4,000 0
AJO IMPROVEMENT COMPANY 2,654 0
MARANA DWID - DERRINGER 1,950 3
TOWN OF HUACHUCA CITY 1,750 2
San Xavier West 1,511 0
Greater Santa Rosa Regional 1,352 0
Topawa Intertie 1,318 0
Vaya Chin Intertie 1,151 0
Mission View Mobile Home Park (Tucson Water Consec 1,125 0
RINCON COUNTRY EAST RV PARK 912 0
RANCHO DEL CONEJO COMM WATER COOP 900 5
METROPOLITAN DWID - E&T SYSTEM 880 0
FAR HORIZONS EAST MHP 870 0
ORGAN PIPE NM HEADQUARTERS 755 0
MARANA MUNICIPAL - SILVERBELL GATEWAY 750 0
Covered Wells Regional 740 0
MISSION PALMS APARTMENTS 720 0
MARANA DWID - CULVER 709 4
VISTA DEL NORTE MHP 554 0
COLDWATER CANYON 1 541 15
TRAILS WEST MHP 500 0
Pisinemo Intertie 472 2
Kerwo Intertie 441 0
Chui Chu 420 0
CACTUS COUNTRY RV RESORT 420 2
AJO DWID 405 0
WHY DWID 400 11
San Xavier Ord (East) 390 0
DIAMOND GROVE MOBILE HOME ESTATES 385 0
FEDERAL CORRECTIONAL INST 350 4
Little Tucson 328 0
SHILOH WATER COMPANY 309 0
VALLE VERDE DEL NORTE 300 0
MESALAND WATER COMPANY 294 0
MT LEMMON DWID 290 0
TOCC 280 0
RIO VIEJO WATER 272 0
RIO MERCADO WATER 266 2
SIERRITA MOUNTAIN WATER COOP 258 0
FAR HORIZONS MHP 258 0
LA CHOLLA AIRPARK 250 0
COLDWATER CANYON 2 247 5
Comobabi Intertie 240 2
DESERT SHORES RV MHP 220 1
RIO VISTA MOBILE HOME PARK 217 2
HALCYON ACRES WATER USERS ASSOCIATION 215 0
MARANA MUNICIPAL - TORTOLITA MOUNTAIN 200 0
CRESCENT MANOR MHP 200 0
CASITAS DE CASTILIAN 167 4
Santa Rosa Ranch Intertie 165 0
RILLITO WATER USERS ASSOC 165 2
PANTANO WATER COOP 156 3
Kaka 150 0
MONTE VISTA WATER COMPANY 150 25
ARIVACA TOWNSITE WATER COOP 150 0
SAMALAYUCA IMPROVEMENT ASSOC 150 0
DESERT WATER COOP 150 1
NORTH LA CHOLLA MHP 150 0
RAINDANCE WATER COOP 148 0
San Pedro 135 0
RANCHO TIERRA BLANCA POA 126 0
Vamori 125 0
Cowlic 120 0
EMPIRITA WATER COMPANY 120 1
COLDWATER CANYON 3 120 0
MARANA MUNICIPAL - PALO VERDE 118 0
MOBILE HOME PROPERTIES 114 0
CATALINA VILLAGE 107 0
Fresnal 105 0
CROSSROADS PARK MHP 100 2
KAHLUA WELL COOP 99 2
SAHUARITA VILLAGE WATER COMPANY 93 7
DESERT PARADISE MHP LLC 90 1
Kohatk 80 0
Ventana 80 0
METROPOLITAN DWID - LAZY B 77 0
RINCON MESA LANDOWNERS 75 2
RIVERSIDE APARTMENTS 75 3
LAZY ACRES MHP 75 0
HIGH CHAPARRAL WATER COOP 72 3
Charco 27 70 0
New Fields 67 0
POCKETKNIFE WATER COOP 65 0
Queens Well 64 0
CAMMIES FOOTHILLS VISTA MHC 62 0
RANCHO SIERRITA WELL ASSOC 55 2
PICACHO PEAK WATER COMPANY 55 10
SHAE WATER COMPANY 54 0
PITA WATER COMPANY 54 4
SUMMIT WATER COOP 53 0
WILDCAT ONE WELL COOP 52 2
SIERRA COURT MHC LLC 51 0
PICO VISTA COMMUNITY WELL 49 0
SUPERSTITION WATER COOP 45 0
KLAFTER WELL COOP 45 0
SASABE BORDER VILLAGE 42 0
Gunsight (Schuchuligk) 40 0
Jackrabbit 40 2
GARIGANS GULCH WATER COOP 35 0
WILMOT WATER USERS GROUP 30 1
CORONADO FOREST DRIVE WATER COOP 30 2
GATOR WATER COMPANY 29 2
SIETE CASAS JOINT VENTURE 25 0

TRI Facilities (35)

# Facility Total Releases
1 Asarco LLC Mission Complex 17.1M lbs
2 Freeport-McMoran Sierrita Inc 10.0M lbs
3 Fluidra 132.4K lbs
4 Learjet Inc 66.6K lbs
5 Polymer Chemistry Innovations Inc 36.3K lbs
6 Swan Rd. Asphalt Plant 36.0K lbs
7 U.S. Dod Usaf Davis-Monthan Afb 30.9K lbs
8 Silver Bell Mining LLC 28.9K lbs
9 Materion Ceramics Inc. 26.9K lbs
10 Federal Correctional Complex - Tucson 17.7K lbs
11 Tangerine Rd. Asphalt Plant 13.0K lbs
12 Calportland Co Rillito Plant 9.1K lbs
13 Triangle Industrial Corp 6.7K lbs
14 Modern Day Products 5.6K lbs
15 Huck International 2.0K lbs
16 Johns Manville 665 lbs
17 Samuel Advanced Fabrication a Div of Samuel Son & Co. 608 lbs
18 Vulcan Materials Co Black Angus 95 lbs
19 U.S. Air Force Plant 44 - Operated By Raytheon 91 lbs
20 Western Emulsions Tucson Emulsions Plant 50 lbs
21 Ventana Medical Systems 40 lbs
22 Jensen Precast 8 lbs
23 Vulcan Materials Co Marana 1 lbs
24 Best Block - Tucson Az Plant 0 lbs
25 Calportland Co Orange Grove Plant 0 lbs
26 Senergy Petroleum LLC - Tucson Bulk Plant 0 lbs
27 Superlite Block 0 lbs
28 Cemex - Columbia Plant 0 lbs
29 Calportland Co Tangerine Plant 0 lbs
30 Calportland Co Swan Plant 0 lbs
31 Itw Polymers Sealants Na 0 lbs
32 Safety-Kleen Systems Inc Tucson (taz) 0 lbs
33 Calportland Ina Plant 0 lbs
34 Calportland Co Poorman Plant 0 lbs
35 Celestica Llc. 0 lbs

Superfund Sites (1)

Site Name Status HRS Score
Tucson International Airport Area NPL Site 57.80

Cities in Pima (13)

Tucson
28 facilities · 92 water
Marana
4 facilities · 7 water
Sahuarita
1 facilities · 3 water
Green Valley
1 facilities · 2 water
Rillito
1 facilities · 1 water
Sells
0 facilities · 27 water
Vail
0 facilities · 7 water
Ajo
0 facilities · 4 water
Amado
0 facilities · 4 water
Oro Valley
0 facilities · 3 water
Arivaca
0 facilities · 1 water
Davis-monthan Afb
0 facilities · 1 water
Sasabe
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Pima, Arizona? ▼
Pima, AZ has an environmental risk score of 71/100 (High Risk), based on 35 TRI facilities, 1 Superfund sites, and 120 water systems on record. 38 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Pima? ▼
Yes, Pima, AZ has 1 Superfund site on the EPA National Priorities List (NPL). Superfund sites are contaminated locations that require long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
How many toxic release facilities are in Pima? ▼
Pima, AZ has 35 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 27.4M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Pima? ▼
In 2024, Pima, AZ recorded a median AQI of 56 and a peak AQI of 171. 31% 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 Pima? ▼
Pima, AZ has 120 EPA-regulated water systems. 38 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 Pima? ▼
Environmental compliance in Pima, Arizona is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Arizona 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