Community Water System · PWS AZ0412308

Sonoita Valley (North) Water Company

Tucson, Arizona 85754 - drinking water served from groundwater sources to 49 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

49
People served: 121
EPA violations: 2
Health-based: Untested
UCMR5 result

The verdict

EPA records 121 drinking-water violations at Sonoita Valley (North) Water Company, 2% of them health-based - below the Arizona per-system average.

121
Total EPA violations on record: 2%
Health-based (MCL / treatment failure): 49
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Sonoita Valley (North) Water Company

Sonoita Valley (North) Water Company is a public/private-owned community water system that delivers drinking water to 49 residents in Tucson, Arizona (Santa Cruz County) through 17 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 2 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 97 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 21 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. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Sonoita Valley (North) Water Company's 121 violations sit below 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

Total Violations

121

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Public/Private
Connections: 17
County: Santa Cruz
School/Daycare: No
MCL Violations: 2
Monitoring Violations: 97
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	21	2012
Consumer Confidence Rule	Other	13	2019
Nitrate	MR	7	2004
Chlorine	MR	7	2018
Total Haloacetic Acids (HAA5)	MR	6	2019
TTHM	MR	5	2019
cis-1,2-Dichloroethylene	MR	2	2001
p-Dichlorobenzene	MR	2	2001
trans-1,2-Dichloroethylene	MR	2	2001
1,2-Dichloroethane	MR	2	2001
1,1,1-Trichloroethane	MR	2	2001
Carbon tetrachloride	MR	2	2001
1,1,2-Trichloroethane	MR	2	2001
Tetrachloroethylene	MR	2	2001
Benzene	MR	2	2001
Ethylbenzene	MR	2	2001
Styrene	MR	2	2001
Coliform (TCR)	MCL	2	2008
1,2-Dichloropropane	MR	2	2001
1,1-Dichloroethylene	MR	2	2001
Toluene	MR	2	2001
o-Dichlorobenzene	MR	2	2001
Trichloroethylene	MR	2	2001
CHLOROBENZENE	MR	2	2001
DICHLOROMETHANE	MR	2	2001
Combined Uranium	MR	1	2004
Radium-226	MR	1	2004
Radium-228	MR	1	2004
Mercury	MR	1	1990
Cadmium	MR	1	1990

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 Sonoita Valley (North) 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 AZ0412308 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 Sonoita Valley (North) 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
2019	Consumer Confidence Rule	Other	13	SDWIS / AZ0412308 / 7000
2019	Total Haloacetic Acids (HAA5)	MR	6	SDWIS / AZ0412308 / 2456
2019	TTHM	MR	5	SDWIS / AZ0412308 / 2950
2018	Chlorine	MR	7	SDWIS / AZ0412308 / 0999
2012	Coliform (TCR)	MR	21	SDWIS / AZ0412308 / 3100
2008	Coliform (TCR)	MCL	2	SDWIS / AZ0412308 / 3100
2004	Nitrate	MR	7	SDWIS / AZ0412308 / 1040
2004	Combined Uranium	MR	1	SDWIS / AZ0412308 / 4006
2004	Radium-226	MR	1	SDWIS / AZ0412308 / 4020
2004	Radium-228	MR	1	SDWIS / AZ0412308 / 4030
2004	Combined Radium (-226 and -228)	MR	1	SDWIS / AZ0412308 / 4010
2004	Gross Alpha, Excl. Radon and U	MR	1	SDWIS / AZ0412308 / 4000
2001	cis-1,2-Dichloroethylene	MR	2	SDWIS / AZ0412308 / 2380
2001	p-Dichlorobenzene	MR	2	SDWIS / AZ0412308 / 2969
2001	trans-1,2-Dichloroethylene	MR	2	SDWIS / AZ0412308 / 2979

How Sonoita Valley (North) Water Company Compares

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

Metric	Sonoita Valley (North) Water Company	Arizona avg	Federal benchmark
Total violations	121	153.3	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	2	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	49	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 Sonoita Valley (North) Water Company water safe to drink? ▼

Sonoita Valley (North) Water Company (PWS ID: AZ0412308) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 49 people using Groundwater sources.

How many people does Sonoita Valley (North) Water Company serve? ▼

Sonoita Valley (North) Water Company serves 49 people in Tucson, Arizona. It is a Public/Private-owned system using Groundwater water sources with 17 service connections.

What type of violations does Sonoita Valley (North) Water Company have? ▼

Sonoita Valley (North) Water Company has 121 total violations: 2 health-based violations (MCL exceedances or treatment failures), 97 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Sonoita Valley (North) Water Company water? ▼

No PFAS testing data is available for Sonoita Valley (North) Water Company under the EPA's UCMR5 monitoring program.

What water source does Sonoita Valley (North) Water Company use? ▼

Sonoita Valley (North) 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.