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Community Water System · PWS AZ0413039

Mayer Dwid

Chino Valley, Arizona 86323 - drinking water served from groundwater sources to 1,400 people, tracked in EPA SDWIS and UCMR5.

1,400
People served
330
EPA violations
19
Health-based
Untested
UCMR5 result

The verdict

EPA records 330 drinking-water violations at Mayer Dwid, 6% of them health-based - above the Arizona per-system average.

330
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
1,400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mayer Dwid

Mayer Dwid is a private-owned community water system that delivers drinking water to 1,400 residents in Chino Valley, Arizona (Yavapai County) through 636 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 330 total violations for this system , of which 19 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 277 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Nitrate, recorded in 74 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%).

Mayer Dwid's 330 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
1,400
Total Violations
330
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
636
County
Yavapai
School/Daycare
No
MCL Violations
19
Monitoring Violations
277
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 74 2025
Arsenic MR 32 2024
TTHM MR 18 2024
Total Haloacetic Acids (HAA5) MR 18 2024
Chlorine MR 15 2025
Arsenic MCL 15 2008
Coliform (TCR) MR 14 2015
Consumer Confidence Rule Other 11 2023
Revised Total Coliform Rule MON 5 2024
Di(2-ethylhexyl) phthalate MR 3 1998
Picloram MR 3 1998
Dinoseb MR 3 1998
Carbofuran MR 3 1998
Atrazine MR 3 1998
LASSO MR 3 1998
Heptachlor MR 3 1998
2,4-D MR 3 1998
2,4,5-TP MR 3 1998
HEXACHLOROBENZENE MR 3 1998
Pentachlorophenol MR 3 1998
Total Polychlorinated Biphenyls (PCB) MR 3 1998
1,2-DIBROMO-3-CHLOROPROPANE MR 3 1998
Chlordane MR 3 1998
Lead and Copper Rule MR 3 2024
Endrin MR 3 1998
BHC-GAMMA MR 3 1998
Methoxychlor MR 3 1998
Toxaphene MR 3 1998
Diquat MR 3 1998
Di(2-ethylhexyl) adipate MR 3 1998

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 Mayer Dwid.

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 AZ0413039 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 Mayer Dwid 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
2025 Nitrate MR 74 SDWIS / AZ0413039 / 1040
2025 Chlorine MR 15 SDWIS / AZ0413039 / 0999
2024 Arsenic MR 32 SDWIS / AZ0413039 / 1005
2024 TTHM MR 18 SDWIS / AZ0413039 / 2950
2024 Total Haloacetic Acids (HAA5) MR 18 SDWIS / AZ0413039 / 2456
2024 Revised Total Coliform Rule MON 5 SDWIS / AZ0413039 / 8000
2024 Lead and Copper Rule MR 3 SDWIS / AZ0413039 / 5000
2023 Consumer Confidence Rule Other 11 SDWIS / AZ0413039 / 7000
2015 Coliform (TCR) MR 14 SDWIS / AZ0413039 / 3100
2008 Arsenic MCL 15 SDWIS / AZ0413039 / 1005
2008 Ethylbenzene MR 2 SDWIS / AZ0413039 / 2992
2008 Xylenes, Total MR 2 SDWIS / AZ0413039 / 2955
2004 Nitrate MCL 1 SDWIS / AZ0413039 / 1040
2003 Coliform (TCR) MCL 2 SDWIS / AZ0413039 / 3100
1998 Di(2-ethylhexyl) phthalate MR 3 SDWIS / AZ0413039 / 2039

How Mayer Dwid Compares

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

Metric Mayer Dwid Arizona avg Federal benchmark
Total violations 330 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 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 1,400 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 Mayer Dwid water safe to drink? ▼
Mayer Dwid (PWS ID: AZ0413039) has 330 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,400 people using Groundwater sources.
How many people does Mayer Dwid serve? ▼
Mayer Dwid serves 1,400 people in Chino Valley, Arizona. It is a Private-owned system using Groundwater water sources with 636 service connections.
What type of violations does Mayer Dwid have? ▼
Mayer Dwid has 330 total violations: 19 health-based violations (MCL exceedances or treatment failures), 277 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mayer Dwid water? ▼
No PFAS testing data is available for Mayer Dwid under the EPA's UCMR5 monitoring program.
What water source does Mayer Dwid use? ▼
Mayer Dwid 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.