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Tap water quality report

Commonwealth Utilities Corp (Tinian)

EPA monitoring tested this supplier for 65 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

65
contaminants tested
10
detected
3,005
people served
5
health-based violations
MP rankingsLead in MPPFAS in MP
Water source
Ground water
Ownership
State government

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.

5
health-based violations
17
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2022-12-31
TT Health-based Resolved 2019-07-30
MCL Health-based Resolved 2008-08-01 → 2008-08-31
MCL Health-based Resolved 2008-04-01 → 2008-04-30
MCL Health-based Resolved 2007-04-01 → 2007-04-30
Other Monitoring Resolved 2022-12-31
MR Monitoring Resolved 2020-01-01
MR Monitoring Resolved 2005-01-01
MR Monitoring Resolved 2005-01-01
MR Monitoring Resolved 2003-01-01

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
4400 µg/L 44%
of the EPA limit 10000 µg/L
 6/6 SYR4 2015–2019
TTHM
13.6 µg/L 17%
of the EPA limit 80 µg/L
worst single sample: 14 µg/L
5/5 SYR4 2015–2019
Lead
0.0015 mg/L 10%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2025
Total Haloacetic Acids (HAA5)
3.3 µg/L 5.5%
of the EPA limit 60 µg/L
 4/5 SYR4 2015–2019
Barium
3.085 µg/L 0.2%
of the EPA limit 2000 µg/L
worst single sample: 3.1 µg/L
2/2 SYR4 2016–2019
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
 2/2 SYR4 2016–2019
Gross Alpha, Excl. Radon And U
4.235 pCi/L 28%
of the EPA limit 15 pCi/L
worst single sample: 4.3 pCi/L
2/2 SYR4 2016–2019
Chromium
1.6 µg/L 1.6%
of the EPA limit 100 µg/L
 1/2 SYR4 2016–2019
Combined Radium (-226 And -228)
1.515 pCi/L 30%
of the EPA limit 5 pCi/L
 1/2 SYR4 2016–2019
Combined Uranium
6.407 µg/L 21%
of the EPA limit 30 µg/L
 1/2 SYR4 2016–2019
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Kevin Watson
Phone
6706644282
Email
[email protected]

Frequently asked questions about Commonwealth Utilities Corp (Tinian)

Is Commonwealth Utilities Corp (Tinian) tap water safe to drink?

EPA monitoring detected 10 contaminants in Commonwealth Utilities Corp (Tinian)'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 Commonwealth Utilities Corp (Tinian)'s water?

EPA monitoring detected Nitrate, TTHM, Lead, Total Haloacetic Acids (HAA5), Barium, and others. The full list with the level and data source for each is above.

How many people does Commonwealth Utilities Corp (Tinian) serve?

Commonwealth Utilities Corp (Tinian) reports serving 3,005 people in MP, per its EPA record.

Has Commonwealth Utilities Corp (Tinian) had any water quality violations?

The EPA has 17 violations on file for Commonwealth Utilities Corp (Tinian), of which 5 are health-based (a contaminant limit or required treatment was breached) and 0 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.