01The verdict: is Glen Arm water safe?
Glen Arm's drinking water has significant quality concerns based on EPA testing data. With a grade of C+ (66.3/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 818 residents using groundwater (wells).
34 unresolved violations on record
EPA records show open compliance items for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓8 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Glen Arm's drinking water received a grade of C+ (66.3 out of 100), indicating fair water quality. The city's 2 water systems serve approximately 818 residents using ground water under influence.
Lead levels were measured at 0.0 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 92 violations on record, including 9 health-based violations. 34 remain unresolved.
Glen Arm ranks #82 out of 107 cities in Maryland for water quality, placing it among the lowest-rated in the state. Glen Arm 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, Glen Arm may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 8 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Glen Arm's water
Every contaminant flagged in Glen Arm, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
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. | 0.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Maryland
Cities ranked by compounds detected Cu Copper in Maryland
Cities ranked by 90th-percentile copper
03Glen Arm's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 92 violations on record, including 9 health-based violations. 34 remain unresolved.
2 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 0 ppb since 1993. Latest reading: 0 ppb (2023) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Glen Arm's water comes from
Glen Arm's drinking water is drawn from underground aquifers through wells.
Ground Water Under Influence
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
2 systems
2 water systems, operated under private ownership.
818 people
Residents served across Glen Arm's service area.
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 818 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| GLEN MEADOWS RETIREMENT COMMUNITY | MD0030208 | 468 | Ground Water Under Influence |
| SUMMERHILL MOBILE HOME PARK | MD0020221 | 350 | Groundwater |
Water bodies near Glen Arm
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Glen Arm's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
10 federal disaster declarations on record for Baltimore County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
Anne Arundel County is in D3 (extreme drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How Glen Arm compares
Scores for nearby Maryland cities on one line, with the average marked.
dashed line = Maryland average (60/100)
Glen Arm scores 66.3/100 — above the Maryland average of 60/100. It outscores 7 of 10 nearby cities. Full Maryland rankings →
95 / 100FBaltimore, MD
39.8 / 100FMillersville, MD
41.6 / 100CColumbia, MD
66 / 100FFrederick, MD
37.5 / 100FLa Plata, MD
39.5 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Glen Arm's water — not generic advice.
A basic carbon filter still helps
Glen Arm's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Glen Arm alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Glen Arm, MD tap water safe to drink?
Glen Arm's water quality earned a grade of C+ (66.3/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #82 out of 107 cities tested in Maryland.
What contaminants are in Glen Arm's water?
Lead was measured at 0.0 ppb (90th percentile). 92 violations are on record.
How is Glen Arm'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 Glen Arm?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Glen Arm's water come from?
Glen Arm's water is sourced from Ground water under influence. The city has 2 water systems serving approximately 818 residents.
What health violations has Glen Arm's water system had?
Glen Arm has 9 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 34 violations remain unresolved.
Is Glen Arm's groundwater at risk of contamination?
Glen Arm 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 92 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 Glen Arm's water compare to other cities?
Glen Arm ranks #82 out of 107 cities in Maryland (better than 23% of state cities) and #11218 out of 15382 cities nationally (27th percentile). The grade of C+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.