Water Quality: Prescott, AZ

20 water systems • 50,473 people served

Multiple Health Violations
824
Total Violations
55
Health-Based Violations
20
Water Systems
50,473
Population Served

Water Quality Summary

Prescott is served by 20 public water systems with a combined service population of 50,473 people, and has 824 EPA Safe Drinking Water Act violations on record. Critically, 55 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Prescott's violation count is 117% above the national average for Arizona. Contaminants associated with violations include Chlorine Dioxide, E. coli, Haloacetic Acids, Selenium, Stage 2 DBP.

Contaminants Found

Chlorine Dioxide

Can cause anemia in infants and young children; may cause nervous system effects at high levels.

Common source: Water treatment disinfectant used to control taste, odor, and microorganisms

EPA limit: 0.8 mg/L

E. coli

Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.

Common source: Fecal contamination from humans or animals entering the water supply

EPA limit: Zero (no E. coli permitted in drinking water)

Haloacetic Acids

Linked to increased cancer risk and potential reproductive and developmental effects with long-term exposure.

Common source: Reaction of chlorine disinfectants with organic matter in treated water

EPA limit: 0.060 mg/L (60 ppb)

Selenium

Hair loss, nail brittleness, and nervous system damage at elevated concentrations.

Common source: Natural geological deposits, mining discharges, oil refinery waste

EPA limit: 0.05 mg/L (50 ppb)

Stage 2 DBP

Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.

Common source: Chlorine disinfection reacting with natural organic matter in source water

EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L

Water Systems Serving Prescott

System Name PWSID Source Population Violations
PRESCOTT CITY OF AZ0413045 Groundwater 42,217 148
BLACK CANYON CITY WID AZ0413051 Groundwater 2,437 44
GRANITE OAKS WATER USERS ASSOCIATION AZ0413155 Groundwater 1,200 32
PONDEROSA PARK DWID AZ0413044 Groundwater 602 39
INSCRIPTION CANYON WATER COMPANY AZ0413263 Groundwater 566 44
YARNELL WATER IMPROVEMENT ASSOCIATION AZ0413057 Groundwater 515 69
BRADSHAW WATER COMPANY INC AZ0413141 Groundwater 510 19
INSCRIPTION CANYON WATER COMPANY AZ0413303 Groundwater 507 78
GROOM CREEK WATER USERS AZ0413040 Groundwater 458 5
HIGHLAND PINE DWID AZ0413034 Groundwater 450 42
WHITE HORSE RANCH OWNERS ASSOCIATION AZ0413221 Groundwater 292 63
QUAIL RIDGE DWID AZ0413307 Groundwater 179 36
AMERICAN RANCH DWID AZ0413258 Groundwater 140 47
BEVERLY GARDENS TRAILER PARK AZ0413408 Groundwater 120 80
RANCHO VIDA RV PARK AZ0413330 Groundwater 57 7
LAKESIDE WATER COMPANY AZ0413026 Groundwater 55 10
PINEHURST WATER COMPANY AZ0413043 Groundwater 54 28
GRANITE DELLS WATER COMPANY AZ0413030 Groundwater 50 7
MANNEKEN APARTMENTS AZ0413264 Groundwater 34 14
JACKSON ACRES DWID AZ0413036 Groundwater 30 12

Concerned About Your Water?

A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.

Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.

Other Cities in Arizona

Phoenix 2811 violations • 2,288,453 served Tucson 5285 violations • 899,456 served Mesa 129 violations • 466,100 served El Mirage 2702 violations • 335,830 served Gilbert 692 violations • 248,247 served Chandler 433 violations • 247,999 served Scottsdale 224 violations • 242,885 served Peoria 301 violations • 195,421 served

View all cities in Arizona →

Data Sources

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.

Verify at epa.gov • Search ECHO for AZ