Is Topock, AZ Tap Water Safe to Drink?
Graded C, with 31 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
60.9/100
waterverge.com Topock, AZ — Water Quality Report
Topock's drinking water received a grade of C (60.9 out of 100), indicating fair water quality. The city's 1 water system serves approximately 3,970 residents using groundwater.
Lead levels were measured at 1.7 ppb (90th percentile), well within EPA limits. UCMR 5 testing detected 1 PFAS compound in the water supply.
The system has 315 violations on record, including 13 health-based violations. 31 remain unresolved.
What to know about Topock's water
Topock ranks #162 out of 292 cities in Arizona for water quality, placing it below average in the state.
Topock relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
PFAS compounds were detected in testing, though levels remain within current EPA limits. Residents seeking extra precaution may consider an activated carbon or reverse osmosis filter.
The system has seen 6 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Topock, AZ water safe to drink?
Topock's drinking water has significant quality concerns based on EPA testing data. With a grade of C (60.9/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 3,970 residents using groundwater (wells).
Recent water quality updates for Topock
A timeline of significant water quality events, violations, and data updates.
Detected at levels within current EPA limits. PFAS persist indefinitely in the environment.
Latest EPA compliance and testing data incorporated into Topock's water quality assessment. Grade: C (60.9/100).
Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: E. COLI.
1 health-based. Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-4620). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Topock's water supply.
Well within EPA limits.
Detected but within current EPA limits. PFAS do not break down in the environment and can accumulate in the body over time. An activated carbon filter can reduce exposure.
Violation history
Topock's water system has 315 total violations on record, including 13 health-based violations. 31 remain unresolved. 6 violations were issued in the last 5 years.
Flood & environmental risk
Coconino County has experienced 6 federally declared disasters since 1970. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Topock's water come from?
Topock's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 3,970 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Topock residents can do
Recommended: Activated carbon or reverse osmosis filter. This addresses the specific contaminants found in Topock's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Topock's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Forever chemicals overview
National PFAS report →Violation summary
Violations & advisories
Drought conditions
D2 — severe droughtMohave County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Coconino County has experienced 6 federally declared disasters since 1970. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Topock's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.7 | 15 | ppb | Inorganic | Safe |
| lithium LithiumInorganic A naturally occurring alkali metal found in groundwater. Monitored under UCMR 5 to assess occurrence in drinking water. Health EffectsKidney effects at high doses. Low-level exposure effects under study; some research suggests neurological effects. EPA LimitNo MCL (monitoring only under UCMR 5) Common SourcesNatural mineral deposits, geothermal water, and industrial discharge. | 22.000 | HI | µg/L | PFAS | Detected |
| NEtFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| NMeFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| PFTA | ND | HI | µg/L | PFAS | Not Detected |
| PFTrDA | ND | HI | µg/L | PFAS | Not Detected |
Lead level trend (90th percentile)
See how Topock compares by contaminant
Explore where Topock ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Topock's water comes from
Topock's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by private ownership and serves approximately 3,970 people through 1 water system.
Water systems serving Topock
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GOLDEN SHORES WATER COMPANY | AZ0408024 | 3,970 | GW |
How Topock compares
Full Arizona rankings →Topock's score of 60.9/100 is above the average of 42/100 among major Arizona cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Arizona rankings →About Topock, AZ
Wikipedia →Williams is a city in Coconino County, Arizona, United States, located west of Flagstaff. As of the 2020 census, Williams had a population of 3,202. It lies on the routes of Historic Route 66 and Interstate 40. It is also the southern terminus of the Grand Canyon Railway, which takes visitors to Grand Canyon Village.
Learn more about your water
Guides and resources related to Topock's water quality findings.
Explore water quality across Mohave
Frequently asked questions
Is Topock, AZ tap water safe to drink?
Topock's water quality earned a grade of C (60.9/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #162 out of 292 cities tested in Arizona.
What contaminants are in Topock's water?
Lead was measured at 1.7 ppb (90th percentile). 1 PFAS compound was detected. 315 violations are on record.
How is Topock's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Topock?
PFAS compounds have been detected. A filter with activated carbon can help reduce exposure.
Where does Topock's water come from?
Topock's water is sourced from Groundwater. The city has 1 water system serving approximately 3,970 residents.
What health violations has Topock's water system had?
Topock has 13 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 31 violations remain unresolved.
Is Topock's groundwater at risk of contamination?
Topock uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 315 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Topock's water compare to other cities?
Topock ranks #162 out of 292 cities in Arizona (better than 45% of state cities) and #12037 out of 15744 cities nationally (24th percentile). The grade of C reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.