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Tap water quality report

Centennial Homeowner'S Association, Inc

EPA monitoring tested this supplier for 66 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

66
contaminants tested
9
detected
115
people served
15
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Ravalli

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.

15
health-based violations
25
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2010-11-01 → 2010-11-30
MCL Health-based Resolved 2010-11-01 → 2010-11-30
MCL Health-based Resolved 2010-11-01 → 2010-11-30
MCL Health-based Resolved 2010-11-01 → 2010-11-30
MCL Health-based Resolved 2010-11-01 → 2010-11-30
MCL Health-based Resolved 2010-08-01 → 2010-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31

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
312 µg/L 24%
of the EPA limit 1300 µg/L
worst single sample: 330 µg/L
10/10 SYR4 2014–2017
Nitrate-Nitrite
1752.5 µg/L 18%
of the EPA limit 10000 µg/L
worst single sample: 1770 µg/L
8/8 SYR4 2012–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 7/7 LCR 2023
Lead
3.75 µg/L 25%
of the EPA limit 15 µg/L
worst single sample: 4 µg/L
6/10 SYR4 2014–2017
Nitrate
1660 µg/L 17%
of the EPA limit 10000 µg/L
 6/6 SYR4 2013–2019
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 4/4 SYR4 2013–2019
Barium
79 µg/L 4%
of the EPA limit 2000 µg/L
worst single sample: 80 µg/L
3/3 SYR4 2013–2019
Fluoride
120 µg/L 3%
of the EPA limit 4000 µg/L
 3/3 SYR4 2013–2019
Combined Radium (-226 And -228)
1 pCi/L 20%
of the EPA limit 5 pCi/L
 2/2 SYR4 2013
57 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MCKINNON, PATRICK
Phone
406-361-3717

Frequently asked questions about Centennial Homeowner'S Association, Inc

Is Centennial Homeowner'S Association, Inc tap water safe to drink?

EPA monitoring detected 9 contaminants in Centennial Homeowner'S Association, Inc'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 Centennial Homeowner'S Association, Inc's water?

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

How many people does Centennial Homeowner'S Association, Inc serve?

Centennial Homeowner'S Association, Inc reports serving 115 people in Montana, per its EPA record.

Has Centennial Homeowner'S Association, Inc had any water quality violations?

The EPA has 25 violations on file for Centennial Homeowner'S Association, Inc, of which 15 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.