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Community Water System · PWS AZ0402043

Monte Vista Water Company

Tucson, Arizona 85756 - drinking water served from groundwater sources to 150 people, tracked in EPA SDWIS and UCMR5.

150
People served
353
EPA violations
76
Health-based
Untested
UCMR5 result

The verdict

EPA records 353 drinking-water violations at Monte Vista Water Company, 22% of them health-based - above the Arizona per-system average.

353
Total EPA violations on record
22%
Health-based (MCL / treatment failure)
150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Monte Vista Water Company

Monte Vista Water Company is a private-owned community water system that delivers drinking water to 150 residents in Tucson, Arizona (Cochise County) through 50 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 353 total violations for this system , of which 76 (22%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 206 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Arsenic, recorded in 71 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Arizona, EPA tracks 1,493 public water systems serving 7,322,166 people, with 228,944 cumulative violations and 15,663 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 153.3 violations. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Monte Vista Water Company's 353 violations sit above the Arizona average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
150
Total Violations
353
Health-Based Violations
76
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
50
County
Cochise
School/Daycare
No
MCL Violations
73
Monitoring Violations
206
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 71 2024
Consumer Confidence Rule Other 46 2024
Chlorine MR 44 2020
Arsenic MR 44 2019
Coliform (TCR) MR 24 2014
Total Haloacetic Acids (HAA5) MR 11 2017
TTHM MR 11 2017
Nitrate MR 9 2006
Lead and Copper Rule MR 6 2015
Public Notice Other 6 2024
LEAD AND COPPER RULE REVISIONS TT 3 2024
LEAD AND COPPER RULE REVISIONS RPT 3 2024
DICHLOROMETHANE MR 2 2001
p-Dichlorobenzene MR 2 2001
Coliform (TCR) MCL 2 2000
1,2-Dichloropropane MR 2 2001
1,1,2-Trichloroethane MR 2 2001
Toluene MR 2 2001
Ethylbenzene MR 2 2001
Styrene MR 2 2001
Revised Total Coliform Rule MON 2 2019
Mercury MR 2 1990
Barium MR 2 1990
Cadmium MR 2 1990
Selenium MR 2 1990
trans-1,2-Dichloroethylene MR 2 2001
Chromium MR 2 1990
o-Dichlorobenzene MR 2 2001
CHLOROBENZENE MR 2 2001
Tetrachloroethylene MR 2 2001

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Monte Vista Water Company.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AZ0402043 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arizona Drinking Water Authority

Arizona DEQ, Drinking Water Program is the primacy agency that licenses and inspects Monte Vista Water Company under EPA-delegated authority.

Open AZ regulator portal

Source: Arizona DEQ, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Arsenic MCL 71 SDWIS / AZ0402043 / 1005
2024 Consumer Confidence Rule Other 46 SDWIS / AZ0402043 / 7000
2024 Public Notice Other 6 SDWIS / AZ0402043 / 7500
2024 LEAD AND COPPER RULE REVISIONS TT 3 SDWIS / AZ0402043 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 3 SDWIS / AZ0402043 / 5200
2020 Chlorine MR 44 SDWIS / AZ0402043 / 0999
2019 Arsenic MR 44 SDWIS / AZ0402043 / 1005
2019 Revised Total Coliform Rule MON 2 SDWIS / AZ0402043 / 8000
2017 Total Haloacetic Acids (HAA5) MR 11 SDWIS / AZ0402043 / 2456
2017 TTHM MR 11 SDWIS / AZ0402043 / 2950
2015 Lead and Copper Rule MR 6 SDWIS / AZ0402043 / 5000
2014 Coliform (TCR) MR 24 SDWIS / AZ0402043 / 3100
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / AZ0402043 / 0600
2006 Nitrate MR 9 SDWIS / AZ0402043 / 1040
2002 2,3,7,8-TCDD MR 1 SDWIS / AZ0402043 / 2063

How Monte Vista Water Company Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Monte Vista Water Company Arizona avg Federal benchmark
Total violations 353 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 76 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 150 4,904 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,493 regulated public water systems in Arizona.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Monte Vista Water Company water safe to drink? ▼
Monte Vista Water Company (PWS ID: AZ0402043) has 353 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 150 people using Groundwater sources.
How many people does Monte Vista Water Company serve? ▼
Monte Vista Water Company serves 150 people in Tucson, Arizona. It is a Private-owned system using Groundwater water sources with 50 service connections.
What type of violations does Monte Vista Water Company have? ▼
Monte Vista Water Company has 353 total violations: 76 health-based violations (MCL exceedances or treatment failures), 206 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Monte Vista Water Company water? ▼
No PFAS testing data is available for Monte Vista Water Company under the EPA's UCMR5 monitoring program.
What water source does Monte Vista Water Company use? ▼
Monte Vista Water Company uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.