Maricopa, 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 Maricopa in Arizona · Population: 4,491,987
TRI sites such as Imsamet of Arizona; Cmc Rebar Arizona; Rexam Beverage Can Co Re: Phoenix Facility; SDWIS systems such as GILBERT, TOWN OF; SCOTTSDALE CITY OF; GLENDALE CITY OF; NPL sites such as Hassayampa Landfill; Indian Bend Wash Area; Luke Air Force Base anchor Maricopa, AZ's EPA extract. Derived burden score 97/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Maricopa include GILBERT, TOWN OF; PEORIA CITY OF; EPCOR - AGUA FRIA, while Imsamet of Arizona leads reported TRI pounds among local Form R filers. AQS median AQI 77 / peak 261 in 2024.
Burden score 97/100 (High Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Maricopa -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Maricopa, AZ: EPA TRI 2023 reporting year
Same facilities, both years
+5.8%
173 facilities that filed in 2022 and 2023
Whole inventory
+0.6%
1.5 million lb → 1.5 million lb, every facility that filed
Between the two reporting years, 16 facilities filed for the first time and 5 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Maricopa, AZ's total reported releases rose from 1.4 million lb in 2022 to 1.5 million lb in 2023, based on EPA TRI filings.
- Maricopa, AZ's land releases fell from 18.8 thousand lb in 2022 to 1.3 thousand lb in 2023, based on EPA TRI filings.
- Maricopa, AZ's off-site transfers rose from 884.3 thousand lb in 2022 to 1.1 million lb in 2023, based on EPA TRI filings.
- Maricopa, AZ's air releases fell from 527.4 thousand lb in 2022 to 438.6 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 | 33 (9%) | 260 | 65 | 261 |
| 2023 | 41 (11%) | 256 | 61 | 183 |
| 2022 | 27 (7%) | 242 | 73 | 264 |
| 2021 | 12 (3%) | 128 | 91 | 297 |
| 2020 | 11 (3%) | 154 | 60 | 282 |
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 (177)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| GILBERT, TOWN OF | 247,600 | 3 |
| SCOTTSDALE CITY OF | 241,361 | 0 |
| GLENDALE CITY OF | 234,766 | 0 |
| PEORIA CITY OF | 187,676 | 2 |
| ARIZONA WATER CO - PINAL VALLEY | 134,432 | 0 |
| EPCOR - AGUA FRIA | 127,718 | 3 |
| AVONDALE CITY OF | 96,130 | 0 |
| ARIZONA WATER CO - APACHE JUNCTION | 62,055 | 0 |
| LIBERTY WATER LPSCO | 55,810 | 2 |
| GOODYEAR WATER DEPARTMENT | 50,001 | 0 |
| SURPRISE CITY OF - MOUNTAIN VISTA | 40,007 | 0 |
| EL MIRAGE CITY OF | 39,884 | 0 |
| EPCOR - SUN CITY | 38,016 | 0 |
| EPCOR - CHAPARRAL CITY | 26,026 | 1 |
| EPCOR - SUN CITY WEST | 25,796 | 0 |
| DESERT OASIS | 23,963 | 0 |
| EPCOR - ANTHEM | 23,826 | 2 |
| Salt River Public Works | 20,951 | 2 |
| PIMA UTILITIES | 20,000 | 4 |
| ARIZONA WATER CO - WHITE TANKS | 18,858 | 0 |
| LAGO DEL ORO WATER COMPANY | 18,132 | 0 |
| EPCOR - NORTH EAST AGUA FRIA | 14,723 | 0 |
| EPCOR - PARADISE VALLEY/SCOTTSDALE | 14,107 | 0 |
| ARIZONA WATER CO - OVERGAARD | 13,797 | 0 |
| ARIZONA WATER CO - LAKESIDE | 12,191 | 0 |
| ARIZONA WATER CO - SEDONA | 12,104 | 2 |
| ARIZONA WATER CO - ORACLE | 10,585 | 0 |
| BEARDSLEY WATER COMPANY 1 | 10,263 | 0 |
| TOLLESON CITY OF | 9,300 | 0 |
| ARIZONA WATER CO - SIERRA VISTA | 9,175 | 3 |
| ARIZONA WATER CO - BISBEE | 8,707 | 3 |
| ARIZONA WATER CO - MIAMI CLAYPOOL | 8,656 | 3 |
| USAF LUKE AIR FORCE BASE | 8,440 | 9 |
| ARIZONA WATER CO - PINEWOOD | 8,089 | 0 |
| SUNRISE WATER COMPANY | 6,490 | 2 |
| WICKENBURG TOWN OF | 6,481 | 0 |
| VALLEY UTILITIES WATER COMPANY GLENDALE | 5,940 | 0 |
| CAVE CREEK WATER | 5,895 | 8 |
| EPCOR- RIO VERDE | 5,330 | 0 |
| EPCOR - TIERRA DEL RIO | 4,868 | 0 |
| EPCOR - LAKE HAVASU | 4,788 | 0 |
| ARIZONA WATER CO - SAN MANUEL | 4,748 | 3 |
| ARIZONA WATER CO - SUPERIOR | 4,393 | 0 |
| ASPC LEWIS COMPLEX WATER SYSTEM | 4,300 | 3 |
| CORDES LAKES WATER COMPANY | 4,257 | 3 |
| DESERT HILLS WATER | 4,220 | 0 |
| MORENCI WATER ELEC CO MAIN | 4,108 | 21 |
| ADOC EYMAN UNIT | 3,969 | 8 |
| CAREFREE WATER COMPANY | 3,894 | 0 |
| HOLLY LAKE RANCH | 3,540 | 0 |
| ARIZONA WATER CO - PINETOP LAKES | 3,513 | 0 |
| ARIZONA WATER CO - RIMROCK | 3,423 | 3 |
| EPCOR - WILLOW VALLEY/KING STREET | 3,408 | 2 |
| WICKENBURG RANCH ESTATES | 2,877 | 0 |
| PICACHO WATER COMPANY | 2,440 | 0 |
| CLEARWATER UTILITY COMPANY INC | 2,175 | 3 |
| ARIZONA WATER CO - AJO | 2,100 | 0 |
| EPCOR - TUBAC | 2,076 | 0 |
| EAST SLOPE WATER COMPANY | 1,980 | 0 |
| GILA BEND TOWN OF | 1,922 | 0 |
| HORSESHOE BEND WATER SYSTEM | 1,857 | 0 |
| ARIZONA WATER CO - TIERRA GRANDE | 1,796 | 3 |
| AWC - VALLEY VISTA | 1,776 | 0 |
| EPCOR - LAKESIDE | 1,775 | 45 |
| FEDERAL CORRECTION INSTITUTION | 1,500 | 7 |
| MESCAL LAKES WATER SYSTEM | 1,390 | 4 |
| CLEAR SPRINGS UTILITY MAIN | 1,385 | 3 |
| EPCOR - MOOVALYA KEYS | 1,298 | 43 |
| LAKE GRIFFIN ISLES MHP (2 WTPS) | 1,212 | 0 |
| WEST END WATER COMPANY - WITTMAN | 1,200 | 0 |
| LIVCO WATER COMPANY | 1,120 | 0 |
| TRILLIUM WATER SYSTEM | 1,100 | 0 |
| BACA FLOAT WATER COMPANY | 1,090 | 0 |
| OAK CREST OF MANVEL | 1,020 | 0 |
| ADOC FLORENCE ASP | 1,001 | 5 |
| ALPINE VILLAGE MHP | 994 | 0 |
| MOUNTAIN GLEN WATER SERVIC LINDEN TRAILS | 975 | 0 |
| AWC - CASA GRANDE WEST WATER COMPANY | 943 | 3 |
| SANDARIO WATER COMPANY | 870 | 3 |
| LONGHORN MEADOWS ADDITION | 855 | 0 |
| CIRCLE CITY - CITY OF SURPRISE | 815 | 3 |
| PATTON PLACE ESTATES | 795 | 0 |
| WALNUT CREEK WATER COMPANY | 728 | 0 |
| YAVAPAI WATER COMPANY | 728 | 0 |
| THE MEADOWS | 702 | 0 |
| ADAMAN MUTUAL WATER COMPANY | 700 | 5 |
| ADJC ADOBE MOUNTAIN SCHOOL | 680 | 2 |
| GASLIGHT SQUARE MOBILE HOME PARK | 675 | 0 |
| NACO WATER CO MAIN | 658 | 0 |
| EAST SLOPE WATER - WEST | 655 | 2 |
| Salt River Lehi | 652 | 0 |
| ARIZONA WATER CO - STANFIELD | 639 | 3 |
| EPCOR - WILLOW VALLEY/LAKE CIMARRON | 596 | 2 |
| PIONEER RV RESORT | 583 | 0 |
| EPCOR - HOLIDAY HARBOR | 559 | 17 |
| EPCOR - MARINA VILLAGE | 528 | 39 |
| SURPRISE, CITY OF BUENA VISTA | 520 | 0 |
| PEAK VIEW RANCH | 508 | 0 |
| ORANGEWOOD MOBILE HOME PARK | 500 | 2 |
| SEDONA VENTURE WATER COMPANY | 480 | 0 |
| MEADOWLEA VILLAGE | 472 | 0 |
| ARIZONA TRAINING PROGRAM | 470 | 5 |
| PARADISE MHP | 460 | 2 |
| HILLCREST WATER COMPANY | 454 | 0 |
| ROOSEVELT RANCH RV & MHP | 430 | 0 |
| EPCOR - PARKER DAM | 429 | 37 |
| ARIZONA WATER CO - WINKELMAN | 424 | 0 |
| MOBILE GARDENS DWID | 400 | 2 |
| SAGUARO VIEW MGMT COMPANY | 400 | 0 |
| MICHIGAN TRAILER PARK | 400 | 0 |
| PICACHO PEAK RV RESORT | 400 | 2 |
| Mille Lacs Island Resort | 400 | 0 |
| WILLOW MANOR MOBILE HOME PARK | 375 | 1 |
| SUNRISE VILLAGE MHP | 353 | 1 |
| WEKIVA FALLS RESORT | 352 | 14 |
| TONTO HILLS DWID | 350 | 0 |
| OCEAN MOBILE HOME PARK | 347 | 1 |
| SHANGRI LA RANCH | 345 | 24 |
| LEISURE LAKE MOBILE ESTATES | 325 | 0 |
| DATELAND PUBLIC SERVICE CO | 319 | 4 |
| QUAIL RUN WATER SYSTEM | 300 | 0 |
| COUNTRY HOME MHP | 300 | 1 |
| HACIENDA DEL SOL MHP | 300 | 1 |
| VENTURA RANCH DWID | 300 | 1 |
| COUNTRYSIDE ESTATES MHP HAYS KS, LLC | 300 | 0 |
| SWEETWATER OAKS | 240 | 0 |
| GW SAGUARO DIST WATER CO - RINCON | 232 | 90 |
| OATMAN WATER COMPANY | 230 | 3 |
| EAGLE VIEW MHP | 230 | 0 |
| SUNLAND WATER COMPANY | 227 | 12 |
| RANCHWOOD COMMUNITY | 225 | 0 |
| WEATHERSTONE LAKES MHP | 221 | 0 |
| VICKSBURG FARM | 220 | 2 |
| CROWN KING WATER COMPANY | 203 | 8 |
| ORANGE ACRES RANCH | 200 | 5 |
| TONTO CREEK WATER COMPANY | 190 | 1 |
| AWC - CASA GRANDE SOUTH WATER COMPANY | 176 | 2 |
| TIMBER VILLAGE MOBILE HOME PK | 176 | 0 |
| SAGUARO ACRES CFD | 175 | 1 |
| ADVANCE MHP | 175 | 1 |
| SILVER CHOLLA LLC | 168 | 0 |
| MOUNTAIN VIEW MHP | 160 | 0 |
| NACO WATER CO BISBEE | 138 | 0 |
| MEADOW ACRES MHP HAYS KS, LLC | 134 | 1 |
| APACHE MOBILE HOME AND RV PARK, LLC | 130 | 13 |
| APACHE LAKE MARINA RESORT | 123 | 6 |
| PALOMA RANCH | 112 | 0 |
| ENCHANTED LAKES ESTATES | 107 | 0 |
| DOUBLE ROCK ESTATES | 105 | 0 |
| Salt River North Mesa | 100 | 0 |
| PEEKABOO WATER COOP | 100 | 7 |
| SIGNAL PEAK WATER COMPANY | 99 | 0 |
| DOUBLE R WATER DISTRIBUTORS, INC. | 98 | 6 |
| BEARDSLEY WATER COMPANY 3 | 96 | 0 |
| GILBERT RIGG WELL COOP | 95 | 0 |
| GARDENDALE MOBILE HOME AND RV PARK | 93 | 26 |
| WHITE TANK WELL INC | 87 | 0 |
| TRIPLE G DAIRY | 84 | 0 |
| SONTEL WATER COOP | 80 | 1 |
| EPCOR - RIO LINDO | 79 | 25 |
| TWO TANKS COMMUNITY WELL | 76 | 3 |
| BELMONT MOUNTAIN DAIRY | 72 | 1 |
| BUCKEYE ACRES MHP | 71 | 0 |
| SWAN LAKE RESORT | 70 | 4 |
| VALLEY VIEW WATER COMPANY | 60 | 6 |
| SUNSET VALLEY MHP HAYS KS, LLC | 60 | 2 |
| RANCHO WELLS INC | 59 | 2 |
| WEST END WATER COMPANY - WHEAT | 55 | 0 |
| GREENFIELD RANCHETTES | 53 | 12 |
| ASHLEY ROSE MHP | 50 | 4 |
| GRANDVIEW WATER COMPANY | 50 | 18 |
| CLEAR SPRINGS UTILITY WELL 6 | 48 | 3 |
| 67 AVE PROPERTY OWNERS ASSOCIATION | 40 | 2 |
| RIM COUNTRY ESTATES MHP | 36 | 2 |
| MEADOW RANCH WATER SYSTEM | 36 | 0 |
| OLIVE AVENUE HOA | 25 | 0 |
| G LAZY B MOBILE HOME PARK | 25 | 1 |
TRI Facilities (50)
Superfund Sites (7)
| Site Name | Status | HRS Score |
|---|---|---|
| Hassayampa Landfill | NPL Site | 42.79 |
| Indian Bend Wash Area | NPL Site | 42.24 |
| Luke Air Force Base | Deleted NPL Site | 37.93 |
| Motorola, Inc. (52nd Street Plant) | NPL Site | 40.83 |
| Nineteenth Avenue Landfill | Deleted NPL Site | 54.27 |
| Phoenix-Goodyear Airport Area | NPL Site | 45.91 |
| Williams Air Force Base | NPL Site | 37.93 |
Cities in Maricopa (34)
Frequently Asked Questions
What is the environmental risk level in Maricopa, Arizona? ▼
Are there Superfund sites in Maricopa? ▼
How many toxic release facilities are in Maricopa? ▼
What is the air quality in Maricopa? ▼
Is the drinking water safe in Maricopa? ▼
What environmental agencies cover Maricopa? ▼
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.