Marlborough, NH 03455

2 water systems • 850 residents

Poor water quality - filtration recommended

D

Score: 24/100

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

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

25

Contaminants Detected

295

Violations on Record

18

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count0 / 25
Violation History7 / 25
Contaminant Severity14 / 25
System Compliance0 / 15
Enforcement History0 / 10
Total Score24%

24 / 100 points

Recommended Water Filters

  • ✓Ultraviolet (UV) Purification
  • ✓Activated Carbon Filter (disinfection byproducts)
  • ✓Whole Home Carbon Filter System
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Marlborough vs NH & National Average

Detected Contaminants

25 contaminants detected across water systems serving this ZIP code

ContaminantCategory
Total Haloacetic Acids (HAA5)Disinfection Byproduct
TTHMDisinfection Byproduct
Coliform (TCR)Microorganism
1,1,1-TrichloroethaneOther
1,1,2-TrichloroethaneOther
1,2-DichloropropaneOther
Consumer Confidence RuleOther
DICHLOROMETHANEOther
1,1-DichloroethyleneVolatile Organic
1,2-DichloroethaneVolatile Organic
1,2,4-TrichlorobenzeneVolatile Organic
BenzeneVolatile Organic
Carbon tetrachlorideVolatile Organic
CHLOROBENZENEVolatile Organic
cis-1,2-DichloroethyleneVolatile Organic
EthylbenzeneVolatile Organic
o-DichlorobenzeneVolatile Organic
p-DichlorobenzeneVolatile Organic
StyreneVolatile Organic
TetrachloroethyleneVolatile Organic
TolueneVolatile Organic
trans-1,2-DichloroethyleneVolatile Organic
TrichloroethyleneVolatile Organic
Vinyl chlorideVolatile Organic
Xylenes, TotalVolatile Organic

Water System Information

Systems Serving This ZIP:
MARLBOROUGH ESTATES, MARLBOROUGH WATER WORKS
Population Served:
850
Systems With Violations:
2 of 2
Major Violations:
267
Enforcement Actions:
295

Nearby Areas

03451

Hinsdale • 0.4 mi away

F

03470

Winchester • 0.6 mi away

C

03447

Fitzwilliam • 1.7 mi away

C

03431

Keene • 1.9 mi away

D

03469

West Swanzey • 2.1 mi away

D

03465

Troy • 3.1 mi away

F

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.