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Tap water quality report

Rio Mercado Water

EPA monitoring tested this supplier for 1 contaminant and detected 1. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

1
contaminants tested
1
detected
266
people served
4
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Private
Counties served
Pima

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
32
violations on file
4
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-10-17
TT Health-based Resolved 2024-10-17
TT Health-based Resolved 2024-10-17
TT Health-based Resolved 2024-10-17
MR Monitoring Unaddressed 2026-01-01
MR Monitoring Unaddressed 2026-01-01
MR Monitoring Unaddressed 2025-07-01
MR Monitoring Unaddressed 2025-07-01
MR Monitoring Archived 2025-01-01 → 2025-12-31
MR Monitoring Archived 2025-01-01 → 2025-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 2/2 LCR 2026

Utility contact

Contact
MOORE, GREG
Phone
520-326-4858
Email
greg@swnph.org

Frequently asked questions about Rio Mercado Water

Is Rio Mercado Water tap water safe to drink?

EPA monitoring detected 1 contaminant in Rio Mercado Water's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Rio Mercado Water's water?

EPA monitoring detected Lead. The full list with the level and data source for each is above.

How many people does Rio Mercado Water serve?

Rio Mercado Water reports serving 266 people in Arizona, per its EPA record.

Has Rio Mercado Water had any water quality violations?

The EPA has 32 violations on file for Rio Mercado Water, of which 4 are health-based (a contaminant limit or required treatment was breached) and 4 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.