Tacna Water Improvement District
EPA ID: AZ0414515 · 500 people served · 2 ZIP codes
Pulled from the federal compliance ledger, 23 violations at Tacna Water Improvement District remain without resolution — the utility delivers drinking water to roughly 500 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 7 (2024) to 8 (2025). The pattern suggests growing compliance challenges.
Service Area Demographics
The Tacna Water Improvement District serves a community with a median household income of $58,511 and an estimated 901 residents across its service area. Approximately 66% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 68% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Tacna Water Improvement District's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Yuma County, Arizona rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Tacna Water Improvement District compares to EPA limits
What This Means For You
Lead and Copper Rule at 17 mg/L exceeds the EPA maximum of mg/L.
Total Trihalomethanes (TTHM) at 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Fecal Coliform at 11 presence exceeds the EPA maximum of presence.
Stage 1 DBP Rule at 9 mg/L exceeds the EPA maximum of mg/L.
Barium at 14 mg/L exceeds the EPA maximum of 2 mg/L.
Total Trihalomethanes (TTHM) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
TACNA WATER IMPROVEMENT DISTRICT (EPA ID: AZ0414515) is a community water system in Arizona that serves approximately 500 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: C (57/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 4, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| September 1, 2025 | Fecal Coliform | Health-based | Unresolved |
| July 1, 2025 | Nickel | Health-based | Unresolved |
| April 1, 2025 | Barium | Health-based | Unresolved |
| March 1, 2025 | Consumer Confidence Report Rule | Monitoring | Resolved |
| February 20, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| January 1, 2025 | Stage 1 DBP Rule | Monitoring | Resolved |
| January 1, 2025 | Nickel | Monitoring | Resolved |
| December 22, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| October 27, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| October 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Nickel | Health-based | Unresolved |
| September 1, 2024 | Fecal Coliform | Health-based | Resolved |
| August 1, 2024 | Fecal Coliform | Health-based | Resolved |
| July 1, 2024 | Consumer Confidence Report Rule | Health-based | Resolved |
| July 1, 2024 | E. coli | Monitoring | Resolved |
| July 1, 2024 | Fecal Coliform | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Treatment Failure | 17 | No |
| Barium | Inorganic | 14 | Yes |
| Fecal Coliform | Microbiological | 11 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 9 | No |
| Consumer Confidence Report Rule | Reporting Failure | 7 | Yes |
| E. coli | Microbiological | 7 | No |
| Nickel | Inorganic | 6 | Yes |
| Revised Total Coliform Rule | Microbiological | 3 | No |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Contaminant 0700 | Other Violation | 1 | Yes |
Health Risk Details
Fluoride (EPA limit: 4 mg/L (secondary standard: 2.0 mg/L))
Tooth & bone damage at high levels At-risk groups: children under 8 during tooth development, elderly with compromised bone density, people with kidney disease.
Removal methods: reverse osmosis, activated alumina, distillation. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 85352 | 0.0043 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Tacna Water Improvement District (AZ0414515) on EPA.gov.
Frequently Asked Questions
Is Tacna Water Improvement District water safe to drink?
Tacna Water Improvement District has recorded 24 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Tacna Water Improvement District serve?
Tacna Water Improvement District serves approximately 500 people across 2 ZIP codes in Arizona.
Where does Tacna Water Improvement District get its water?
The primary water source is groundwater.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Tacna Water Improvement District (EPA ID: AZ0414515) — request the latest Consumer Confidence Report or ask about specific contaminants.