Is Tacna, AZ Tap Water Safe to Drink?
Graded D, with 114 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
48/100
waterverge.com Tacna, AZ — Water Quality Report
Tacna's drinking water received a grade of D (48 out of 100), indicating poor water quality. The city's 3 water systems serve approximately 845 residents using groundwater.
Lead levels were measured at 4.3 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 706 violations on record, including 63 health-based violations. 114 remain unresolved.
What to know about Tacna's water
Tacna ranks #206 out of 292 cities in Arizona for water quality, placing it below average in the state.
Tacna 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, Tacna may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 105 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Tacna, AZ water safe to drink?
Tacna's drinking water has significant quality concerns based on EPA testing data. With a grade of D (48/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 845 residents using groundwater (wells).
Recent water quality updates for Tacna
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Tacna's water quality assessment. Grade: D (48/100).
1 health-based. Contaminants: Interim Enhanced Surface Water Treatment Rule, Chlorine, Surface Water Treatment Rule.
1 health-based. Contaminants: Interim Enhanced Surface Water Treatment Rule, Chlorine, Surface Water Treatment Rule.
2 health-based. Contaminants: Public Notice, Interim Enhanced Surface Water Treatment Rule, Arsenic.
Key contaminant findings
Based on the most recent EPA sampling data for Tacna's water supply.
Well within EPA limits.
Violation history
Tacna's water system has 706 total violations on record, including 63 health-based violations. 114 remain unresolved. 105 violations were issued in the last 5 years.
Where does Tacna's water come from?
Tacna's drinking water comes from groundwater (wells), supplied by 3 water systems serving approximately 845 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Tacna residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Tacna'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D2 — severe droughtYuma 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.
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. | 4.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Tacna compares by contaminant
Explore where Tacna ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Tacna's water comes from
Tacna'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 local government ownership and serves approximately 845 people through 3 water systems.
Water systems serving Tacna
| System Name | PWSID | Population | Source |
|---|---|---|---|
| TACNA WATER IMPROVEMENT DISTRICT | AZ0414515 | 500 | GW |
| CS MOHAWK UTILITY COMPANY | AZ0414030 | 243 | SW |
| CS CITRUS PARK WATER COMPANY | AZ0414107 | 102 | GW |
How Tacna compares
Full Arizona rankings →Tacna's score of 48/100 is above the average of 42/100 among major Arizona cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Arizona rankings →Learn more about your water
Guides and resources related to Tacna's water quality findings.
Explore water quality across Yuma
Frequently asked questions
Is Tacna, AZ tap water safe to drink?
Tacna's water quality earned a grade of D (48/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #206 out of 292 cities tested in Arizona.
What contaminants are in Tacna's water?
Lead was measured at 4.3 ppb (90th percentile). 706 violations are on record.
How is Tacna'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 Tacna?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Tacna's water come from?
Tacna's water is sourced from Groundwater. The city has 3 water systems serving approximately 845 residents.
What health violations has Tacna's water system had?
Tacna has 63 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 114 violations remain unresolved.
Is Tacna's groundwater at risk of contamination?
Tacna 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 706 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 Tacna's water compare to other cities?
Tacna ranks #206 out of 292 cities in Arizona (better than 29% of state cities) and #13543 out of 15744 cities nationally (14th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.