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Tap water quality report

Rillito Water Users Assoc

EPA monitoring tested this supplier for 71 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

71
contaminants tested
11
detected
165
people served
6
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.

6
health-based violations
125
violations on file
1
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
MCL Health-based Resolved 2000-01-01 → 2002-12-31
MCL Health-based Resolved 1999-09-01 → 1999-09-30
RPT Monitoring Unaddressed 2025-07-02
Other Monitoring Resolved 2024-12-20
Other Monitoring Resolved 2024-12-20
RPT Monitoring Resolved 2024-10-17

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
5799.5 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 5800 µg/L
22/22 SYR4 2012–2019
Copper
88 µg/L 6.8%
of the EPA limit 1300 µg/L
worst single sample: 100 µg/L
9/10 SYR4 2014–2017
Lead
0.0120 mg/L 80%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2023
TTHM
4.015 µg/L 5%
of the EPA limit 80 µg/L
worst single sample: 4.4 µg/L
8/9 SYR4 2012–2019
Nitrate-Nitrite
5701.5 µg/L 57%
of the EPA limit 10000 µg/L
worst single sample: 5790 µg/L
4/4 SYR4 2012–2013
Lead
1.955 µg/L 13%
of the EPA limit 15 µg/L
worst single sample: 2 µg/L
2/10 SYR4 2014–2017
Total Haloacetic Acids (HAA5)
3.47 µg/L 5.8%
of the EPA limit 60 µg/L
worst single sample: 3.6 µg/L
2/9 SYR4 2012–2019
Arsenic
1.2 µg/L 12%
of the EPA limit 10 µg/L
 1/1 SYR4 2012
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Fluoride
490 µg/L 12%
of the EPA limit 4000 µg/L
 1/1 SYR4 2012
Xylenes, Total
0.5900 µg/L 0%
of the EPA limit 10000 µg/L
 1/3 SYR4 2012–2018
60 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CARBAJAL, JUANITA
Phone
520-609-2245
Email
[email protected]

Frequently asked questions about Rillito Water Users Assoc

Is Rillito Water Users Assoc tap water safe to drink?

EPA monitoring detected 11 contaminants in Rillito Water Users Assoc'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 Rillito Water Users Assoc's water?

EPA monitoring detected Nitrate, Copper, Lead, TTHM, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does Rillito Water Users Assoc serve?

Rillito Water Users Assoc reports serving 165 people in Arizona, per its EPA record.

Has Rillito Water Users Assoc had any water quality violations?

The EPA has 125 violations on file for Rillito Water Users Assoc, of which 6 are health-based (a contaminant limit or required treatment was breached) and 1 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.