D27/100
OTIS AIR NATIONAL GUARD BASE — Water Quality Report 2026
Serving 6,000 people · Massachusetts
Water Source
Groundwater
County
—
System ID
MA4096001
Violations
18
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.58 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
2
Unresolved
2
Health-Related
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
TIER 1 — URGENTResolved
Maximum Contaminant Level Violation
When: September 1, 2021 – September 22, 2021Rule: Total Coliform RuleEnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About OTIS AIR NATIONAL GUARD BASE
Is OTIS AIR NATIONAL GUARD BASE water safe to drink?
OTIS AIR NATIONAL GUARD BASE water receives a grade of D (27/100), which is considered poor. 1 contaminant(s) exceed EPA legal limits and 18 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has OTIS AIR NATIONAL GUARD BASE detected?
39 contaminants were tested in OTIS AIR NATIONAL GUARD BASE's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does OTIS AIR NATIONAL GUARD BASE have any EPA violations?
Yes, OTIS AIR NATIONAL GUARD BASE has 18 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, MCL. 11 are health-based violations.
How many people does OTIS AIR NATIONAL GUARD BASE serve?
OTIS AIR NATIONAL GUARD BASE serves approximately 6,000 people, Massachusetts. The system provides water to 1 community: Falmouth.
What type of water does OTIS AIR NATIONAL GUARD BASE provide?
OTIS AIR NATIONAL GUARD BASE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MA4096001.
How does OTIS AIR NATIONAL GUARD BASE compare to other utilities in Massachusetts?
OTIS AIR NATIONAL GUARD BASE scores 27/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Massachusetts state page for a full comparison of water systems.