Tap WaterIndex

← Montana

Tap water quality report

Ap Williams

EPA monitoring tested this supplier for 57 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

57
contaminants tested
5
detected
280
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Private
Counties served
Flathead

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
38
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2022-07-01
Other Monitoring Resolved 2022-07-01
MON Monitoring Resolved 2019-08-01 → 2019-08-31
MON Monitoring Resolved 2019-08-01 → 2019-08-31
MON Monitoring Resolved 2019-08-01 → 2019-08-31
MON Monitoring Resolved 2019-08-01 → 2019-08-31
MR Monitoring Resolved 2003-01-01 → 2003-12-31
MR Monitoring Resolved 2003-01-01 → 2003-12-31
MR Monitoring Resolved 2003-01-01 → 2003-12-31
MR Monitoring Resolved 2003-01-01 → 2003-12-31

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
Nitrate-Nitrite
180 µg/L 1.8%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2026
Copper
110 µg/L 8.5%
of the EPA limit 1300 µg/L
 3/10 SYR4 2014–2017
Combined Radium (-226 And -228)
0.8000 pCi/L 16%
of the EPA limit 5 pCi/L
 1/2 SYR4 2012–2017
Gross Alpha, Excl. Radon And U
1.5 pCi/L 10%
of the EPA limit 15 pCi/L
 1/2 SYR4 2012–2017
52 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromodichloromethaneBromoformChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneChloroformCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WILLIAMS LLC, AP
Phone
406-393-2127
Email
justin@apec-mt.com

Frequently asked questions about Ap Williams

Is Ap Williams tap water safe to drink?

EPA monitoring detected 5 contaminants in Ap Williams'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 Ap Williams's water?

EPA monitoring detected Nitrate-Nitrite, Lead, Copper, Combined Radium (-226 And -228), Gross Alpha, Excl. Radon And U. The full list with the level and data source for each is above.

How many people does Ap Williams serve?

Ap Williams reports serving 280 people in Montana, per its EPA record.

Has Ap Williams had any water quality violations?

The EPA has 38 violations on file for Ap Williams, of which 0 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.