La Paz County Water Quality
Arizona
According to EPA SDWIS, La Paz County, Arizona hosts 12 community water systems covering about 16,343 people. The same extract lists 97 health-based violation records across 5 systems. Counts are historical EPA registry rows, not a current compliance or drinkability score.
La Paz County, Arizona hosts 12 EPA-regulated community water systems delivering drinking water to approximately 16,343 people. Each system is catalogued in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which mandates monitoring for dozens of regulated contaminants, public notification when standards are exceeded, and the issuance of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 97 violation records across these active community systems, with 5 systems carrying at least one record. The extract excludes monitoring and reporting violations. The county contains 5 incorporated places where these systems deliver service.
A historical health-based registry row does not establish water delivered today or describe current compliance. For current conditions, request the utility's most recent Consumer Confidence Report or contact the Arizona drinking water program. Figures shown here reflect only the health-based subset fetched from federal EPA SDWIS.
What water systems serve La Paz County?
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| Big River Development | 3,550 | 3 | Health |
| Colorado River Regional Water System | 3,476 | 17 | Health |
| Town of Parker | 3,360 | 0 | Clean |
| QUARTZSITE TOWN OF | 2,761 | 0 | Clean |
| EHRENBERG IMPROVEMENT DISTRICT | 989 | 0 | Clean |
| 88 SHADES RV PARK | 488 | 0 | Clean |
| Q MOUNTAIN VISTA MHP | 440 | 0 | Clean |
| WENDEN DWID | 360 | 28 | Health |
| Lost Lake Resort | 355 | 0 | Clean |
| BOUSE DWID | 284 | 34 | Health |
| Bermuda Palms | 172 | 0 | Clean |
| CIENEGA WATER COMPANY INC | 108 | 15 | Health |
How does La Paz County compare in Arizona?
Of the 15 Arizona counties with at least one community water system on file, La Paz County ranks #12 by number of systems (12).
Either side of it: Cochise County (32), Yuma County (23), Santa Cruz County (9), Graham County (8)
What are La Paz County's health-based records for?
La Paz County's health-based violation records carry 8 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results, and a historical record does not establish present water quality.
| Contaminant | Records | Systems |
|---|---|---|
| Arsenic | 46 | 2 |
| Fluoride | 14 | 1 |
| Groundwater Rule | 13 | 3 |
| Revised Total Coliform Rule | 11 | 2 |
| Total Haloacetic Acids (HAA5) | 4 | 1 |
| Tthm | 4 | 1 |
| Coliform (TCR) | 3 | 1 |
| Lead and Copper Rule Revisions | 2 | 2 |
About This Data
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
Figures here are the current EPA SDWIS extract joined to the 12 community water systems whose service area falls in La Paz County, ranked against the 15 Arizona counties with at least one system on file. Data current as of 2026-08-25. Editorial standards, methodology, report an error.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
Read our methodology - how this data is sourced, computed, and verified.