Seneca, WI 54654

1 water system • 250 residents

Moderate water quality - consider filtration

C

Score: 47/100

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

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

20

Contaminants Detected

72

Violations on Record

18

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count5 / 25
Violation History16 / 25
Contaminant Severity2 / 25
System Compliance0 / 15
Enforcement History0 / 10
Total Score47%

47 / 100 points

Recommended Water Filters

  • ✓Point-of-Use Carbon Filter (NSF-certified for lead)
  • ✓Ultraviolet (UV) Purification
  • ✓Activated Carbon Filter (disinfection byproducts)
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Seneca vs WI & National Average

Detected Contaminants

20 contaminants detected across water systems serving this ZIP code

ContaminantCategory
AtrazineAgricultural
Lead and Copper RuleHeavy Metal
Coliform (TCR)Microorganism
1,1,1-TrichloroethaneOther
1,2-DichloropropaneOther
ChlorineOther
ETHYLENE DIBROMIDEOther
1,1-DichloroethyleneVolatile Organic
1,2-DichloroethaneVolatile Organic
BenzeneVolatile Organic
Carbon tetrachlorideVolatile Organic
CHLOROBENZENEVolatile Organic
cis-1,2-DichloroethyleneVolatile Organic
o-DichlorobenzeneVolatile Organic
p-DichlorobenzeneVolatile Organic
TetrachloroethyleneVolatile Organic
trans-1,2-DichloroethyleneVolatile Organic
TrichloroethyleneVolatile Organic
Vinyl chlorideVolatile Organic
Xylenes, TotalVolatile Organic

Water System Information

Systems Serving This ZIP:
SENECA SANITARY DIST NO 1
Population Served:
250
Systems With Violations:
1 of 1
Major Violations:
27
Enforcement Actions:
72

Nearby Areas

54645

Mount Sterling

C

54626

Eastman • 4.8 mi away

B

53826

Wauzeka • 6.7 mi away

B

54631

Gays Mills • 7 mi away

C

53821

Prairie Du Chien • 10.7 mi away

F

54655

Soldiers Grove • 13.1 mi away

C

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.