La Paz, 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.
Environmental data for La Paz in Arizona · Population: 16,605
TRI sites such as Evoqua Water Technologies LLC; Morgan Truck Body LLC Maz Ehrenberg; SDWIS systems such as Big River Development; Colorado River Regional Water System; Town of Parker anchor La Paz, AZ's EPA extract. Derived burden score 25/100 (Low 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 La Paz include Big River Development; Colorado River Regional Water System; WENDEN DWID, while Evoqua Water Technologies LLC leads reported TRI pounds among local Form R filers. AQS median AQI 47 / peak 105 in 2024.
Burden score 25/100 (Low 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 La Paz -- 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.
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 | 224 (62%) | 135 | 4 | 105 |
| 2023 | 257 (71%) | 104 | 3 | 126 |
| 2022 | 275 (77%) | 83 | 1 | 130 |
| 2021 | 254 (70%) | 107 | 0 | 187 |
| 2020 | 292 (80%) | 72 | 2 | 125 |
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 (12)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| Big River Development | 3,550 | 3 |
| Colorado River Regional Water System | 3,476 | 17 |
| Town of Parker | 3,360 | 0 |
| QUARTZSITE TOWN OF | 2,761 | 0 |
| EHRENBERG IMPROVEMENT DISTRICT | 989 | 0 |
| 88 SHADES RV PARK | 488 | 0 |
| Q MOUNTAIN VISTA MHP | 440 | 0 |
| WENDEN DWID | 360 | 28 |
| Lost Lake Resort | 355 | 0 |
| BOUSE DWID | 284 | 34 |
| Bermuda Palms | 172 | 0 |
| CIENEGA WATER COMPANY INC | 108 | 15 |
TRI Facilities (2)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Evoqua Water Technologies LLC | 607 lbs |
| 2 | Morgan Truck Body LLC Maz Ehrenberg | 0 lbs |
Cities in La Paz (5)
Frequently Asked Questions
What is the environmental risk level in La Paz, Arizona? ▼
Are there Superfund sites in La Paz? ▼
How many toxic release facilities are in La Paz? ▼
What is the air quality in La Paz? ▼
Is the drinking water safe in La Paz? ▼
What environmental agencies cover La Paz? ▼
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.