Community Water System · PWS AZ0410142

Rancho del Conejo Comm Water Coop

Tucson, Arizona 85743 - drinking water served from groundwater sources to 900 people, tracked in EPA SDWIS and UCMR5.

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

900
People served: 275
EPA violations: 46
Health-based: Untested
UCMR5 result

The verdict

EPA records 275 drinking-water violations at Rancho del Conejo Comm Water Coop, 17% of them health-based - above the Arizona per-system average.

275
Total EPA violations on record: 17%
Health-based (MCL / treatment failure): 900
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rancho del Conejo Comm Water Coop

Rancho del Conejo Comm Water Coop is a private-owned community water system that delivers drinking water to 900 residents in Tucson, Arizona (Pima County) through 335 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 275 total violations for this system , of which 46 (17%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 212 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Arsenic, recorded in 67 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%).

Rancho del Conejo Comm Water Coop's 275 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

900

Total Violations

275

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Private
Connections: 335
County: Pima
School/Daycare: No
MCL Violations: 39
Monitoring Violations: 212
Treatment Tech Violations: 7

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Arsenic	MR	67	2017
Coliform (TCR)	MR	45	2016
Arsenic	MCL	35	2016
Lead and Copper Rule	MR	17	2017
Consumer Confidence Rule	Other	11	2015
Revised Total Coliform Rule	TT	7	2017
E. COLI	MR	6	2017
Nitrate	MR	5	2005
Coliform (TCR)	MCL	4	2001
p-Dichlorobenzene	MR	2	2000
1,1-Dichloroethylene	MR	2	2000
trans-1,2-Dichloroethylene	MR	2	2000
1,2-Dichloroethane	MR	2	2000
Carbon tetrachloride	MR	2	2000
Trichloroethylene	MR	2	2000
1,1,2-Trichloroethane	MR	2	2000
CHLOROBENZENE	MR	2	2000
Benzene	MR	2	2000
Ethylbenzene	MR	2	2000
cis-1,2-Dichloroethylene	MR	2	2000
Xylenes, Total	MR	2	2000
1,1,1-Trichloroethane	MR	2	2000
1,2-Dichloropropane	MR	2	2000
Tetrachloroethylene	MR	2	2000
Toluene	MR	2	2000
Styrene	MR	2	2000
DICHLOROMETHANE	MR	2	2000
Revised Total Coliform Rule	MON	2	2016
o-Dichlorobenzene	MR	2	2000
1,2,4-Trichlorobenzene	MR	2	2000

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 Rancho del Conejo Comm Water Coop.

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 AZ0410142 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 Rancho del Conejo Comm Water Coop 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
2017	Arsenic	MR	67	SDWIS / AZ0410142 / 1005
2017	Lead and Copper Rule	MR	17	SDWIS / AZ0410142 / 5000
2017	Revised Total Coliform Rule	TT	7	SDWIS / AZ0410142 / 8000
2017	E. COLI	MR	6	SDWIS / AZ0410142 / 3014
2016	Coliform (TCR)	MR	45	SDWIS / AZ0410142 / 3100
2016	Arsenic	MCL	35	SDWIS / AZ0410142 / 1005
2016	Revised Total Coliform Rule	MON	2	SDWIS / AZ0410142 / 8000
2016	Revised Total Coliform Rule	RPT	1	SDWIS / AZ0410142 / 8000
2015	Consumer Confidence Rule	Other	11	SDWIS / AZ0410142 / 7000
2005	Nitrate	MR	5	SDWIS / AZ0410142 / 1040
2004	Radium-226	MR	1	SDWIS / AZ0410142 / 4020
2004	Combined Radium (-226 and -228)	MR	1	SDWIS / AZ0410142 / 4010
2004	Radium-228	MR	1	SDWIS / AZ0410142 / 4030
2002	Heptachlor epoxide	MR	1	SDWIS / AZ0410142 / 2067
2002	2,3,7,8-TCDD	MR	1	SDWIS / AZ0410142 / 2063

How Rancho del Conejo Comm Water Coop Compares

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

Metric	Rancho del Conejo Comm Water Coop	Arizona avg	Federal benchmark
Total violations	275	153.3	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	46	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	900	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 Rancho del Conejo Comm Water Coop water safe to drink? ▼

Rancho del Conejo Comm Water Coop (PWS ID: AZ0410142) has 275 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 900 people using Groundwater sources.

How many people does Rancho del Conejo Comm Water Coop serve? ▼

Rancho del Conejo Comm Water Coop serves 900 people in Tucson, Arizona. It is a Private-owned system using Groundwater water sources with 335 service connections.

What type of violations does Rancho del Conejo Comm Water Coop have? ▼

Rancho del Conejo Comm Water Coop has 275 total violations: 46 health-based violations (MCL exceedances or treatment failures), 212 monitoring/reporting violations, and 7 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Rancho del Conejo Comm Water Coop water? ▼

No PFAS testing data is available for Rancho del Conejo Comm Water Coop under the EPA's UCMR5 monitoring program.

What water source does Rancho del Conejo Comm Water Coop use? ▼

Rancho del Conejo Comm Water Coop 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.