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Tap water quality report

Mt Lemmon Dwid

EPA monitoring tested this supplier for 80 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
17
detected
290
people served
0
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.

0
health-based violations
251
violations on file
2
still open
ViolationTypeStatusPeriod
MR Monitoring Unaddressed 2026-01-01
RPT Monitoring Unaddressed 2025-07-02
Other Monitoring Resolved 2024-03-24
Other Monitoring Resolved 2024-03-24
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31
MR Monitoring Resolved 2024-01-01 → 2024-12-31

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 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
Copper
460 µg/L 35%
of the EPA limit 1300 µg/L
worst single sample: 860 µg/L
81/87 SYR4 2012–2019
Lead
22.02 µg/L 147%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 50.7 µg/L
53/86 SYR4 2012–2019
Nitrate
339 µg/L 3.4%
of the EPA limit 10000 µg/L
worst single sample: 350 µg/L
32/32 SYR4 2012–2019
Lead
0.0057 mg/L 38%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
TTHM
47.095 µg/L 59%
of the EPA limit 80 µg/L
worst single sample: 48.2 µg/L
14/14 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
30.375 µg/L 51%
of the EPA limit 60 µg/L
worst single sample: 32 µg/L
14/14 SYR4 2012–2019
Barium
10 µg/L 0.5%
of the EPA limit 2000 µg/L
 4/4 SYR4 2013–2016
Fluoride
880 µg/L 22%
of the EPA limit 4000 µg/L
 4/4 SYR4 2013–2016
Nitrate-Nitrite
315 µg/L 3.2%
of the EPA limit 10000 µg/L
worst single sample: 330 µg/L
4/4 SYR4 2014–2016
Bromodichloromethane
8.665 µg/L
No EPA limit set
worst single sample: 8.7 µg/L
2/2 SYR4 2019
Chloroform
18.05 µg/L
No EPA limit set
worst single sample: 18.3 µg/L
2/2 SYR4 2019
Dibromochloromethane
5.425 µg/L
No EPA limit set
worst single sample: 5.5 µg/L
2/2 SYR4 2019
Trichloroacetic Acid
9.415 µg/L
No EPA limit set
worst single sample: 9.6 µg/L
2/2 SYR4 2019
Bromoform
0.6000 µg/L
No EPA limit set
 1/2 SYR4 2019
Combined Radium (-226 And -228)
1.6 pCi/L 32%
of the EPA limit 5 pCi/L
 1/3 SYR4 2014–2019
Dibromoacetic Acid
2.2 µg/L
No EPA limit set
 1/2 SYR4 2019
Dichloroacetic Acid
8.6 µg/L
No EPA limit set
 1/2 SYR4 2019
63 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DAVIS, NATHAN L
Phone
520-576-1538
Email
[email protected]

Frequently asked questions about Mt Lemmon Dwid

Is Mt Lemmon Dwid tap water safe to drink?

EPA monitoring detected 17 contaminants in Mt Lemmon Dwid'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 Mt Lemmon Dwid's water?

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

How many people does Mt Lemmon Dwid serve?

Mt Lemmon Dwid reports serving 290 people in Arizona, per its EPA record.

Has Mt Lemmon Dwid had any water quality violations?

The EPA has 251 violations on file for Mt Lemmon Dwid, of which 0 are health-based (a contaminant limit or required treatment was breached) and 2 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.