Pinal, AZ
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 Pinal in Arizona · Population: 449,219
TRI sites such as Asarco LLC Ray Mine Operations; Casa Grande Dairy Products LLC; Arizona Environmental Container Corp; SDWIS systems such as QUEEN CREEK TOWN OF; EPCOR - SAN TAN; GW SANTA CRUZ WATER CO anchor Pinal, AZ's EPA extract. Derived burden score 61/100 (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 Pinal total 6.8M lbs; health-flagged SDWIS rows include EPCOR - SAN TAN; GW SANTA CRUZ WATER CO; GRIC DPW Wild Horse Pass, while Asarco LLC Ray Mine Operations leads TRI pounds. AQS median AQI 77 / peak 337 in 2024.
Largest TRI sites in the extract: Asarco LLC Ray Mine Operations; Casa Grande Dairy Products LLC; Arizona Environmental Container Corp. Named SDWIS systems: QUEEN CREEK TOWN OF; EPCOR - SAN TAN; GW SANTA CRUZ WATER CO. Burden score 61/100 (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 Pinal, AZ: EPA TRI 2023 reporting year
Same facilities, both years
+31.7%
27 facilities that filed in 2022 and 2023
Whole inventory
+33.2%
1.3 million lb → 1.8 million lb, every facility that filed
Between the two reporting years, 7 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Pinal, AZ's total reported releases rose from 1.3 million lb in 2022 to 1.7 million lb in 2023, based on EPA TRI filings.
- Pinal, AZ's off-site transfers rose from 58.3 thousand lb in 2022 to 87.7 thousand lb in 2023, based on EPA TRI filings.
- Pinal, AZ's land releases rose from 1.1 million lb in 2022 to 1.5 million lb in 2023, based on EPA TRI filings.
- Pinal, AZ's air releases fell from 196.8 thousand lb in 2022 to 161.1 thousand lb in 2023, based on EPA TRI filings.
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 | 77 (21%) | 219 | 65 | 337 |
| 2023 | 109 (30%) | 211 | 38 | 709 |
| 2022 | 91 (25%) | 238 | 28 | 689 |
| 2021 | 72 (20%) | 240 | 49 | 198 |
| 2020 | 86 (23%) | 196 | 74 | 1194 |
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 (74)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| QUEEN CREEK TOWN OF | 95,502 | 0 |
| EPCOR - SAN TAN | 87,435 | 2 |
| GW SANTA CRUZ WATER CO | 84,000 | 2 |
| GRIC DPW Wild Horse Pass | 22,795 | 8 |
| FLORENCE WATER COMPANY | 15,900 | 1 |
| APACHE JUNCTION WATER DISTRICT | 15,610 | 6 |
| Ak-Chin Village | 11,646 | 3 |
| EPCOR - SAN TAN ANTHEM | 10,362 | 0 |
| CCA - ELOY COMPLEX | 8,852 | 0 |
| ELOY CITY OF | 7,903 | 0 |
| QUAIL CREEK WATER COMPANY | 6,812 | 0 |
| GW FARMERS WATER CO - CONTINENTAL | 5,592 | 0 |
| GRIC DPW Sacaton | 5,307 | 1 |
| GW FARMERS WATER CO - SANTA RITA SPRINGS | 3,990 | 0 |
| GW SANTA CRUZ WATER CO - RED ROCK | 3,813 | 0 |
| GW SAGUARO DIST WATER CO - LAS QUINTAS | 3,720 | 0 |
| GW OCOTILLO WATER - RANCHO DEL SOL LINDO | 3,128 | 0 |
| GRIC DPW Casa Blanca_Bapchule | 2,603 | 1 |
| GRIC DPW Stotonic | 2,566 | 1 |
| THUNDERBIRD FARMS DWID | 2,231 | 58 |
| KEARNY TOWN OF | 1,950 | 6 |
| UTILITY SOURCE LLC | 1,710 | 1 |
| QUEEN VALLEY DWID | 1,200 | 0 |
| MAMMOTH TOWN OF | 1,181 | 0 |
| GW SANTA CRUZ WATER - MARICOPA SW | 1,170 | 0 |
| GW OCOTILLO WATER - CATALINA | 1,168 | 0 |
| COPPER MOUNTAIN RANCH CFD | 1,071 | 18 |
| MARICOPA CONSOLIDATED DWID | 928 | 11 |
| GW OCOTILLO WATER - DIAMOND BELL | 706 | 0 |
| GW -BWC, INC- SUNSHINE | 604 | 8 |
| SUN VALLEY FARMS UNIT VI | 600 | 9 |
| DESERT GARDENS RV RESORT CO-OP, INC | 532 | 33 |
| PAPAGO BUTTE DWID | 530 | 145 |
| GW OCOTILLO WATER - VALLEY VIEW ACRES | 496 | 0 |
| GW FARMERS WATER CO - SAHUARITA | 492 | 0 |
| GW FARMERS WATER CO - SAHUARITA HIGHLAND | 492 | 3 |
| MARICOPA MOUNTAIN DWID 1 | 450 | 54 |
| GW -BWC, INC- BUCKEYE RANCH | 422 | 0 |
| VALLE ESCONDIDO | 405 | 16 |
| SILVERBELL IRRIGATION & DRAINAGE DIST | 375 | 4 |
| PICACHO DWID | 340 | 4 |
| GW -BWC, INC.- NSWC | 319 | 0 |
| GW -BWC, INC- EAGLETAIL | 288 | 0 |
| VILLA GRANDE DWID | 283 | 86 |
| GW OCOTILLO WATER - SILVERBELL WEST | 263 | 0 |
| GW SAGUARO DIST WATER CO - TALA WAY | 255 | 0 |
| ARIZONIAN RV RESORT | 225 | 7 |
| WHISPERING WIND MOBILE HOME PARK | 200 | 4 |
| SIERRA VISTA RV PARK | 200 | 46 |
| GW SAGUARO DIST WATER CO - MIRABELL | 180 | 0 |
| GW OCOTILLO WATER - THUNDERHEAD | 174 | 0 |
| ANTELOPE PEAK DWID | 150 | 130 |
| GW- BWC, INC- DIXIE | 132 | 0 |
| ORCHARD VALLEY MOBILE HOME PARK | 130 | 0 |
| MARICOPA MOUNTAIN DWID 2 | 120 | 0 |
| GW SAGUARO DIST WATER CO - LYN LEE | 114 | 0 |
| GW SAGUARO DIST WATER CO - AMBER ANN | 108 | 0 |
| NEW SADDLEBACK VISTA | 100 | 77 |
| GW OCOTILLO WATER - SIERRITA FOOTHILLS | 84 | 0 |
| CATALINA COUNTRY ESTATES | 77 | 0 |
| GW -BWC, INC.- WPE #6 | 69 | 0 |
| GW SAGUARO DIST WATER CO - TORTOLITA | 69 | 0 |
| GW- BWC, INC- ROSEVIEW | 66 | 0 |
| AMERICAN REALTY MORTGAGE COMPANY | 60 | 7 |
| GW SANTA CRUZ WATER -TWIN HAWKS WATER | 57 | 0 |
| GW- BWC, INC- GARDEN CITY | 51 | 0 |
| BIDEGAIN WATER COMPANY | 49 | 2 |
| NORTHERN SECTION 4 COOP | 48 | 2 |
| DAVIS RANCH LAND OWNERS | 40 | 0 |
| BREEZEWAY TRAILER PARK | 38 | 9 |
| GW SANTA CRUZ WATER - CP WATER CO | 37 | 0 |
| SAGUARO MOBILE HOME PARK | 36 | 0 |
| GRIC DPW Aerodyne | 35 | 1 |
| INDIAN HILLS ESTATES | 30 | 13 |
TRI Facilities (41)
Cities in Pinal (17)
Frequently Asked Questions
What is the environmental risk level in Pinal, Arizona? ▼
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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.
Read our methodology - how this data is sourced, computed, and verified.