Oskaloosa, IA 52577

5 water systems • 24,586 residents

Poor water quality - filtration recommended

D

Score: 38/100

Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.

Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts

31

Contaminants Detected

494

Violations on Record

44

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count0 / 25
Violation History13 / 25
Contaminant Severity14 / 25
System Compliance3 / 15
Enforcement History0 / 10
Total Score38%

38 / 100 points

Recommended Water Filters

  • ✓Point-of-Use Carbon Filter (NSF-certified for lead)
  • ✓Reverse Osmosis or Ion Exchange Filter
  • ✓Ultraviolet (UV) Purification
  • ✓Whole Home Carbon Filter System
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Oskaloosa vs IA & National Average

Detected Contaminants

31 contaminants detected across water systems serving this ZIP code

ContaminantCategory
AtrazineAgricultural
NitrateAgricultural
ArsenicHeavy Metal
BariumHeavy Metal
CadmiumHeavy Metal
ChromiumHeavy Metal
Lead and Copper RuleHeavy Metal
MercuryHeavy Metal
SeleniumHeavy Metal
AsbestosInorganic
FluorideInorganic
Coliform (TCR)Microorganism
Revised Total Coliform RuleMicroorganism
1,1,2-TrichloroethaneOther
1,2-DichloropropaneOther
CARBON, TOTALOther
Di(2-ethylhexyl) phthalateOther
DICHLOROMETHANEOther
Interim Enhanced Surface Water Treatment RuleOther
Surface Water Treatment RuleOther
Combined Radium (-226 and -228)Radiological
Gross Alpha, Excl. Radon and URadiological
CHLOROBENZENEVolatile Organic
cis-1,2-DichloroethyleneVolatile Organic
EthylbenzeneVolatile Organic
o-DichlorobenzeneVolatile Organic
StyreneVolatile Organic
TetrachloroethyleneVolatile Organic
TolueneVolatile Organic
trans-1,2-DichloroethyleneVolatile Organic
Xylenes, TotalVolatile Organic

Water System Information

Systems Serving This ZIP:
BUSSEY WATER SUPPLY, OAK CREEK MHP, OSKALOOSA MUNICIPAL WATER DEPT, MAHASKA RURAL WATER (NEW SHARON), MAHASKA RURAL WATER SYSTEM, INC.
Population Served:
24,586
Systems With Violations:
4 of 5
Major Violations:
268
Enforcement Actions:
491

Nearby Areas

50119

Harvey • 13.8 mi away

B

50027

Barnes City • 15.8 mi away

B

52563

Hedrick • 19.6 mi away

B

52536

Blakesburg • 21.4 mi away

A

52531

Albia • 21.5 mi away

D

52501

Ottumwa • 21.8 mi away

B

Frequently Asked Questions

What does the grade mean?

Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.

Is my tap water safe to drink?

Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.

How often is the data updated?

We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.

What filters do you recommend?

Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.