Water Quality in Crow Agency, MT (59022)

EPA violation data for public water systems serving ZIP code 59022.

No Health-Based Violations

None of the 7 water systems serving this ZIP have exceeded federal contaminant limits in the past 5 years. There are164 monitoring/reporting violations (missed testing deadlines), all resolved.

Better than 98% of US ZIP codes.

Based on EPA compliance data. Not a substitute for an official water quality report from your utility.

2,307

Population

7

Water Systems

164

Violations (5yr)

0

Health-Based

Location

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Water Systems Serving This Area (7)

Little Bighorn Battlefield Nm

All resolved
Groundwater 2,020 people served
1 violation (5yr) · All resolved

Crow Agency Water System

All resolved
Surface water 1,300 people served
46 violations (5yr) · All resolved
Lead tested: 1 ppb (limit: 15 ppb) ✓

Crow Agency Water Plant

Surface water 1,200 people served
0 violations

Pryor Water System

Groundwater 406 people served
10 violations (5yr)
Lead tested: 0 ppb (limit: 15 ppb) ✓

Wyola Water System

Groundwater 261 people served
107 violations (5yr)
Lead tested: 1 ppb (limit: 15 ppb) ✓

Little Bighorn Camp

Groundwater 102 people served
0 violations

Little Big Horn Camp

Groundwater 102 people served
0 violations

Contaminants Found

Lead and Copper RuleMonitoring

Lead and copper testing requirement. Lead exposure can cause developmental harm in children.

12 violations
Has active
Interim Enhanced Surface Water Treatment RuleMonitoring
8 violations
All resolved
Consumer Confidence RuleMonitoring

Annual water quality report delivery requirement.

5 violations
All resolved
DICHLOROMETHANEMonitoring
4 violations
All resolved
1,1,2-TrichloroethaneMonitoring
4 violations
All resolved
Carbon tetrachlorideMonitoring
4 violations
All resolved
trans-1,2-DichloroethyleneMonitoring
4 violations
All resolved
TetrachloroethyleneMonitoring
4 violations
All resolved
TrichloroethyleneMonitoring
4 violations
All resolved
p-DichlorobenzeneMonitoring
4 violations
All resolved
StyreneMonitoring
4 violations
All resolved
1,2,4-TrichlorobenzeneMonitoring
4 violations
All resolved
o-DichlorobenzeneMonitoring
4 violations
All resolved
1,1,1-TrichloroethaneMonitoring
4 violations
All resolved
1,1-DichloroethyleneMonitoring
4 violations
All resolved
EthylbenzeneMonitoring
4 violations
All resolved
cis-1,2-DichloroethyleneMonitoring
4 violations
All resolved
Xylenes, TotalMonitoring
4 violations
All resolved
Vinyl chlorideMonitoring
4 violations
All resolved
1,2-DichloroethaneMonitoring
4 violations
All resolved
BenzeneMonitoring
4 violations
All resolved
CHLOROBENZENEMonitoring
4 violations
All resolved
TolueneMonitoring
4 violations
All resolved
1,2-DichloropropaneMonitoring
4 violations
All resolved
ChlorineMonitoring

Used to disinfect water — generally safe at regulated levels.

4 violations
All resolved
Nitrate-NitriteMonitoring
2 violations
All resolved
CARBON, TOTALMonitoring
2 violations
All resolved
Total Haloacetic Acids (HAA5)Monitoring
2 violations
All resolved
TTHMMonitoring
2 violations
All resolved
Beryllium, TotalMonitoring
1 violation
All resolved
Antimony, TotalMonitoring
1 violation
All resolved
ChromiumMonitoring
1 violation
All resolved
MercuryMonitoring
1 violation
All resolved
Thallium, TotalMonitoring
1 violation
All resolved
SeleniumMonitoring
1 violation
All resolved
CadmiumMonitoring
1 violation
All resolved
BariumMonitoring
1 violation
All resolved
ArsenicMonitoring

A naturally occurring element that can cause cancer and other health effects at high levels.

1 violation
All resolved
NickelMonitoring
1 violation
All resolved
CYANIDEMonitoring
1 violation
All resolved
E. COLIMonitoring
1 violation
All resolved
AtrazineMonitoring
1 violation
All resolved
HEXACHLOROBENZENEMonitoring
1 violation
All resolved
Heptachlor epoxideMonitoring
1 violation
All resolved
ToxapheneMonitoring
1 violation
All resolved
HeptachlorMonitoring
1 violation
All resolved
1,2-DIBROMO-3-CHLOROPROPANEMonitoring
1 violation
All resolved
EndrinMonitoring
1 violation
All resolved
2,4-DMonitoring
1 violation
All resolved
Benzo(a)pyreneMonitoring
1 violation
All resolved
ChlordaneMonitoring
1 violation
All resolved
CarbofuranMonitoring
1 violation
All resolved
HexachlorocyclopentadieneMonitoring
1 violation
All resolved
OXAMYLMonitoring
1 violation
All resolved
PentachlorophenolMonitoring
1 violation
All resolved
Di(2-ethylhexyl) adipateMonitoring
1 violation
All resolved
GlyphosateMonitoring
1 violation
All resolved
MethoxychlorMonitoring
1 violation
All resolved
Total Polychlorinated Biphenyls (PCB)Monitoring
1 violation
All resolved
PicloramMonitoring
1 violation
All resolved
Di(2-ethylhexyl) phthalateMonitoring
1 violation
All resolved
BHC-GAMMAMonitoring
1 violation
All resolved
ETHYLENE DIBROMIDEMonitoring
1 violation
All resolved
DiquatMonitoring
1 violation
All resolved
EndothallMonitoring
1 violation
All resolved
DalaponMonitoring
1 violation
All resolved
DinosebMonitoring
1 violation
All resolved
LASSOMonitoring
1 violation
All resolved
SimazineMonitoring
1 violation
All resolved
2,4,5-TPMonitoring
1 violation
All resolved

Lead & Copper Levels

Lead (Pb)

Within limit
1 ppb measured Action level: 15 ppb

Sampled: Jul 2025

How Does This Compare?

Crow Agency (59022) has more violations than 98% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 164, most of which are monitoring/reporting issues.

Fewer violations 98th percentile More violations

Water Filter Recommendations

No contaminant issues detected. For general protection, a basic carbon filter removes common impurities like chlorine and sediment. Look for NSF/ANSI 42 certified products.

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