F0/100
MOUNTAIN LAKES WATER DEP — Water Quality Report 2026
Serving 4,012 people · New Jersey
Water Source
Groundwater
County
—
System ID
NJ1425001
Violations
317
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.009 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
6
Violations (last 5yr)
3
Unresolved
0
Health-Related
TIER 3Unresolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 3Unresolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – August 22, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: October 1, 2023 – January 26, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – September 5, 2023Enforcement: Resolving — corrective action underway
TIER 3Unresolved
Surface water treatment technique failure
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 MOUNTAIN LAKES WATER DEP
Is MOUNTAIN LAKES WATER DEP water safe to drink?
MOUNTAIN LAKES WATER DEP water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 317 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MOUNTAIN LAKES WATER DEP detected?
31 contaminants were tested in MOUNTAIN LAKES WATER DEP's water. Notable contaminants include PFOA, Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does MOUNTAIN LAKES WATER DEP have any EPA violations?
Yes, MOUNTAIN LAKES WATER DEP has 317 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other.
How many people does MOUNTAIN LAKES WATER DEP serve?
MOUNTAIN LAKES WATER DEP serves approximately 4,012 people, New Jersey. The system provides water to 4 communities: Parsippany Troy-Hills-1429, Mountain Lakes Boro-1425, Denville Twp.-1408, Boonton Twp.-1402.
What type of water does MOUNTAIN LAKES WATER DEP provide?
MOUNTAIN LAKES WATER DEP sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NJ1425001.
How does MOUNTAIN LAKES WATER DEP compare to other utilities in New Jersey?
MOUNTAIN LAKES WATER DEP scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our New Jersey state page for a full comparison of water systems.