01The verdict: is Coyote Canyon, Brimhall, Bass Lake water safe?
Coyote Canyon, Brimhall, Bass Lake's drinking water has significant quality concerns based on EPA testing data. With a grade of A (91.7/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 622 residents using groundwater (wells).
3 unresolved violations on record
EPA records show open compliance items for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 1.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓Check back after the next refresh
EPA data updates on a rolling basis; we fold in new samples and violations every month.
Get alerts ↓Coyote Canyon, Brimhall, Bass Lake's drinking water received a grade of A (91.7 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 622 residents using groundwater.
Lead levels were measured at 1.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 51 violations on record, including 0 health-based violations. 3 remain unresolved.
Coyote Canyon, Brimhall, Bass Lake ranks #42 out of 271 cities in Arizona for water quality, placing it above average in the state. Coyote Canyon, Brimhall, Bass Lake 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. As a small community water system, Coyote Canyon, Brimhall, Bass Lake may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Coyote Canyon, Brimhall, Bass Lake's water
Every contaminant flagged in Coyote Canyon, Brimhall, Bass Lake, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
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. | 1.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Arizona
Cities ranked by compounds detected Cu Copper in Arizona
Cities ranked by 90th-percentile copper
03Coyote Canyon, Brimhall, Bass Lake's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 51 violations on record, including 0 health-based violations. 3 remain unresolved.
9 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 3 ppb since 1994. Latest reading: 1 ppb (2025) — 7% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Coyote Canyon, Brimhall, Bass Lake's water comes from
Coyote Canyon, Brimhall, Bass Lake's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
1 system
1 water system, operated under native american ownership.
622 people
Residents served across Coyote Canyon, Brimhall, Bass Lake's service area.
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 native american ownership and serves approximately 622 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| Coyote Canyon-Bass Lake NTUA | NN3500274 | 622 | Groundwater |
05How Coyote Canyon, Brimhall, Bass Lake compares
Scores for nearby Arizona cities on one line, with the average marked.
dashed line = Arizona average (41/100)
Coyote Canyon, Brimhall, Bass Lake scores 91.7/100 — above the Arizona average of 41/100. It outscores 10 of 10 nearby cities. Full Arizona rankings →
37.5 / 100FTucson, AZ
38.1 / 100FMesa, AZ
40.6 / 100FChandler, AZ
40.5 / 100FGilbert, AZ
34.8 / 100FScottsdale, AZ
43 / 100
06What to do at home
Steps matched to what testing actually found in Coyote Canyon, Brimhall, Bass Lake's water — not generic advice.
A basic carbon filter still helps
Coyote Canyon, Brimhall, Bass Lake's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Coyote Canyon, Brimhall, Bass Lake alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Coyote Canyon, Brimhall, Bass Lake, AZ tap water safe to drink?
Coyote Canyon, Brimhall, Bass Lake's water quality earned a grade of A (91.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #42 out of 271 cities tested in Arizona.
What contaminants are in Coyote Canyon, Brimhall, Bass Lake's water?
Lead was measured at 1.0 ppb (90th percentile). 51 violations are on record.
How is Coyote Canyon, Brimhall, Bass Lake'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 Coyote Canyon, Brimhall, Bass Lake?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Coyote Canyon, Brimhall, Bass Lake's water come from?
Coyote Canyon, Brimhall, Bass Lake's water is sourced from Groundwater. The city has 1 water system serving approximately 622 residents.
Is Coyote Canyon, Brimhall, Bass Lake's groundwater at risk of contamination?
Coyote Canyon, Brimhall, Bass Lake 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 51 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 Coyote Canyon, Brimhall, Bass Lake's water compare to other cities?
Coyote Canyon, Brimhall, Bass Lake ranks #42 out of 271 cities in Arizona (better than 85% of state cities) and #1549 out of 15382 cities nationally (90th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Coyote Canyon, Brimhall, Bass Lake's small water system affect quality?
Coyote Canyon, Brimhall, Bass Lake's system serves approximately 622 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 51 violations on record.