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Tap water quality report

Lockwood Water and Sewer District

EPA monitoring tested this supplier for 99 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

99
contaminants tested
18
detected
5,900
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Yellowstone

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
9
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2013-07-01
Other Monitoring Resolved 2013-07-01
MR Monitoring Archived 2011-01-01 → 2013-12-31
MR Monitoring Resolved 2004-07-01 → 2004-09-30
MR Monitoring Resolved 2004-07-01 → 2004-09-30
MR Monitoring Resolved 2004-07-01 → 2004-09-30
MR Monitoring Resolved 2004-07-01 → 2004-09-30
MR Monitoring Resolved 2004-07-01 → 2004-09-30
MR Monitoring Resolved 2004-07-01 → 2004-09-30

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
Bromodichloromethane
10.8 µg/L
No EPA limit set
worst single sample: 15 µg/L
65/65 SYR4 2012–2019
Chloroform
59.2 µg/L
No EPA limit set
worst single sample: 71 µg/L
65/65 SYR4 2012–2019
TTHM
70 µg/L 88%
of the EPA limit 80 µg/L
worst single sample: 79 µg/L
65/65 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
62.35 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 89 µg/L
58/58 SYR4 2012–2019
Dibromochloromethane
2.6 µg/L
No EPA limit set
worst single sample: 3.2 µg/L
57/65 SYR4 2012–2019
Dichloroacetic Acid
26.2 µg/L
No EPA limit set
worst single sample: 41 µg/L
57/57 SYR4 2012–2019
Trichloroacetic Acid
32.4 µg/L
No EPA limit set
worst single sample: 41 µg/L
57/57 SYR4 2012–2019
Monochloroacetic Acid
6.885 µg/L
No EPA limit set
worst single sample: 8.8 µg/L
48/57 SYR4 2012–2019
Copper
424.7 µg/L 33%
of the EPA limit 1300 µg/L
worst single sample: 1060 µg/L
40/40 SYR4 2014–2017
Dibromoacetic Acid
0.7100 µg/L
No EPA limit set
worst single sample: 0.8800 µg/L
31/57 SYR4 2012–2019
Monobromoacetic Acid
1.2 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
22/57 SYR4 2012–2019
Lead
5.95 µg/L 40%
of the EPA limit 15 µg/L
worst single sample: 24 µg/L
20/40 SYR4 2014–2017
Nitrate-Nitrite
530 µg/L 5.3%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2023
Fluoride
485 µg/L 12%
of the EPA limit 4000 µg/L
worst single sample: 500 µg/L
4/4 SYR4 2012–2018
Lithium
57 µg/L
No EPA limit set
 4/4 UCMR-5 2023
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 1/8 SYR4 2012–2019
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
 1/3 SYR4 2012–2014
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ARIZTIA, MICHAEL J
Phone
406-259-4120

Frequently asked questions about Lockwood Water and Sewer District

Is Lockwood Water and Sewer District tap water safe to drink?

EPA monitoring detected 18 contaminants in Lockwood Water and Sewer District'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 Lockwood Water and Sewer District's water?

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

How many people does Lockwood Water and Sewer District serve?

Lockwood Water and Sewer District reports serving 5,900 people in Montana, per its EPA record.

Has Lockwood Water and Sewer District had any water quality violations?

The EPA has 9 violations on file for Lockwood Water and Sewer District, 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.