Is Londonderry, VT Tap Water Safe to Drink?
Graded C- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
59/100
waterverge.com Londonderry, VT — Water Quality Report
Londonderry's drinking water received a grade of C- (59 out of 100), indicating poor water quality. The city's 4 water systems serve approximately 539 residents using groundwater.
Lead levels were measured at 1.2 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 289 violations on record, including 26 health-based violations. 25 remain unresolved.
What to know about Londonderry's water
Londonderry ranks #82 out of 105 cities in Vermont for water quality, placing it among the lowest-rated in the state.
Londonderry relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Londonderry may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 14 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Londonderry, VT water safe to drink?
Londonderry's drinking water has significant quality concerns based on EPA testing data. With a grade of C- (59/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 539 residents using groundwater (wells).
Recent water quality updates for Londonderry
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Londonderry's water quality assessment. Grade: C- (59/100).
Contaminants: Nitrate.
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
1 health-based. Contaminants: Revised Total Coliform Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Londonderry's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Londonderry's water system has 289 total violations on record, including 26 health-based violations. 25 remain unresolved. 14 violations were issued in the last 5 years.
Where does Londonderry's water come from?
Londonderry's drinking water comes from groundwater (wells), supplied by 4 water systems serving approximately 539 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Londonderry residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Londonderry's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D1 — moderate droughtWindham County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Recommended water filters
Based on contaminants detected in Londonderry's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.2 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 2.16 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Londonderry compares by contaminant
Explore where Londonderry ranks among all Vermont cities for specific contaminants.
Water source & infrastructure
Where Londonderry's water comes from
Londonderry's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by private ownership and serves approximately 539 people through 4 water systems.
Water systems serving Londonderry
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MAGIC VILLAGE WATER COOP | VT0005294 | 308 | GW |
| TRAILSIDE AT MAGIC MOUNTAIN | VT0020151 | 150 | GW |
| MOUNTAIN SIDE CONDOMINIUM | VT0005577 | 45 | GW |
| SMITH HAVEN CENTER | VT0005583 | 36 | GW |
How Londonderry compares
Full Vermont rankings →Londonderry's score of 59/100 is below the average of 77/100 among major Vermont cities. It outscores 2 of 10 nearby cities. 8 of 10 nearby cities score higher.
Nearby cities
View Vermont rankings →About Londonderry, VT
Learn more about your water
Guides and resources related to Londonderry's water quality findings.
Explore water quality across Windham
Frequently asked questions
Is Londonderry, VT tap water safe to drink?
Londonderry's water quality earned a grade of C- (59/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #82 out of 105 cities tested in Vermont.
What contaminants are in Londonderry's water?
Lead was measured at 1.2 ppb (90th percentile). 289 violations are on record.
How is Londonderry's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Londonderry?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Londonderry's water come from?
Londonderry's water is sourced from Groundwater. The city has 4 water systems serving approximately 539 residents.
What health violations has Londonderry's water system had?
Londonderry has 26 health-based violations on record. The most recent violation was recorded in April 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 25 violations remain unresolved.
Is Londonderry's groundwater at risk of contamination?
Londonderry uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 289 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Londonderry's water compare to other cities?
Londonderry ranks #82 out of 105 cities in Vermont (better than 22% of state cities) and #12237 out of 15744 cities nationally (22th percentile). The grade of C- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.