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ASARCO MISSION UNIT

PWS ID: AZ0420005 · SAHUARITA, Arizona 85629

ASARCO MISSION UNIT serves 544 people in SAHUARITA, Arizona using Groundwater water sources. It has 120 recorded EPA violations, including 4 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: ASARCO MISSION UNIT

ASARCO MISSION UNIT is a public/private-owned non-transient non-community water system that delivers drinking water to 544 residents in SAHUARITA, Arizona (Pima County) through 8 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 120 total violations for this system , of which 4 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 114 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MR). 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. ASARCO MISSION UNIT's 120 violations sit below the Arizona average. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%). 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
544
Total Violations
120
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Public/Private
Connections
8
County
Pima
School/Daycare
No
MCL Violations
4
Monitoring Violations
114
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 22 2015
Fluoride MR 6 1989
Chlorine MR 3 2016
Fluoride MCL 3 1980
Nitrate MR 2 1998
Endrin MR 2 2001
BHC-GAMMA MR 2 2001
Diquat MR 2 2001
Endothall MR 2 2001
Glyphosate MR 2 2001
OXAMYL MR 2 2001
Di(2-ethylhexyl) phthalate MR 2 2001
Picloram MR 2 2001
Dinoseb MR 2 2001
Hexachlorocyclopentadiene MR 2 2001
Carbofuran MR 2 2001
Atrazine MR 2 2001
LASSO MR 2 2001
Heptachlor MR 2 2001
2,4-D MR 2 2001
2,4,5-TP MR 2 2001
HEXACHLOROBENZENE MR 2 2001
Benzo(a)pyrene MR 2 2001
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2001
ETHYLENE DIBROMIDE MR 2 2001
Chlordane MR 2 2001
Simazine MR 2 2001
Heptachlor epoxide MR 2 2001
Di(2-ethylhexyl) adipate MR 2 2001
Methoxychlor 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 ASARCO MISSION UNIT.

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 AZ0420005 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 ASARCO MISSION UNIT 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
2016 Chlorine MR 3 SDWIS / AZ0420005 / 0999
2015 Coliform (TCR) MR 22 SDWIS / AZ0420005 / 3100
2001 Endrin MR 2 SDWIS / AZ0420005 / 2005
2001 BHC-GAMMA MR 2 SDWIS / AZ0420005 / 2010
2001 Diquat MR 2 SDWIS / AZ0420005 / 2032
2001 Endothall MR 2 SDWIS / AZ0420005 / 2033
2001 Glyphosate MR 2 SDWIS / AZ0420005 / 2034
2001 OXAMYL MR 2 SDWIS / AZ0420005 / 2036
2001 Di(2-ethylhexyl) phthalate MR 2 SDWIS / AZ0420005 / 2039
2001 Picloram MR 2 SDWIS / AZ0420005 / 2040
2001 Dinoseb MR 2 SDWIS / AZ0420005 / 2041
2001 Hexachlorocyclopentadiene MR 2 SDWIS / AZ0420005 / 2042
2001 Carbofuran MR 2 SDWIS / AZ0420005 / 2046
2001 Atrazine MR 2 SDWIS / AZ0420005 / 2050
2001 LASSO MR 2 SDWIS / AZ0420005 / 2051

How ASARCO MISSION UNIT Compares

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

Metric ASARCO MISSION UNIT Arizona avg Federal benchmark
Total violations 120 153.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 4 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 544 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is ASARCO MISSION UNIT water safe to drink? ▼
ASARCO MISSION UNIT (PWS ID: AZ0420005) has 120 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 544 people using Groundwater sources.
How many people does ASARCO MISSION UNIT serve? ▼
ASARCO MISSION UNIT serves 544 people in SAHUARITA, Arizona. It is a Public/Private-owned system using Groundwater water sources with 8 service connections.
What type of violations does ASARCO MISSION UNIT have? ▼
ASARCO MISSION UNIT has 120 total violations: 4 health-based violations (MCL exceedances or treatment failures), 114 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in ASARCO MISSION UNIT water? ▼
No PFAS testing data is available for ASARCO MISSION UNIT under the EPA's UCMR5 monitoring program.
What water source does ASARCO MISSION UNIT use? ▼
ASARCO MISSION UNIT uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial