01The verdict: is Ellicott City water safe?
Ellicott City's drinking water has significant quality concerns based on EPA testing data. With a grade of D (45/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 7 water systems serve approximately 939 residents using surface water (rivers, lakes, or reservoirs).
Copper is over its legal limit
Measured at 1.78 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Lead is well under the limit
90th-percentile lead is 2.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓116 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 ↓Ellicott City's drinking water received a grade of D (45 out of 100), indicating poor water quality. The city's 7 water systems serve approximately 939 residents using purchased surface water.
Lead levels were measured at 2.0 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 453 violations on record, including 56 health-based violations. 57 remain unresolved.
Ellicott City ranks #98 out of 107 cities in Maryland for water quality, placing it among the lowest-rated in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. As a small community water system, Ellicott City may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 116 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Ellicott City's water
Every contaminant flagged in Ellicott City, 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.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.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. | 2.0 | 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. | 1.78 | 1.3 | mg/L | Inorganic | Over Limit |
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
03Ellicott City'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 453 violations on record, including 56 health-based violations. 57 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 3 ppb since 1993. Latest reading: 2 ppb (2025) — 13% of the action level. Sampled at higher-risk homes (90th percentile).
▼ Down 9.8 mg/L since 1993. The latest reading (1.8 mg/L, 2019) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Ellicott City's water comes from
Ellicott City's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Purchased Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Wholesale supplier
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
7 systems
7 water systems, operated under private ownership.
939 people
Residents served across Ellicott City's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by private ownership and serves approximately 939 people through 7 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| LUTHERAN VILLAGE AT MILLER'S GRANT | MD0130007 | 315 | Purchased Surface Water |
| TRIPLE J MHP | PA7360055 | 200 | Groundwater |
| ROCKBROOK VILLAGE MOBILE HOME PARK | MD0060214 | 150 | Groundwater |
| IRISH CREEK MHP | PA3060113 | 90 | Groundwater |
| LAKEVIEW MHP LLC | MD0060208 | 76 | Groundwater |
| SULLIVANS MOBILE HOME PARK COMMUNITY | MD0060215 | 70 | Groundwater |
| TAYLORSVILLE MHC, LLC | MD0060216 | 38 | Groundwater |
Water bodies near Ellicott City
As a surface-water system, these water bodies may directly influence Ellicott City's drinking water supply.
05Pressure on Ellicott City'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.
Industrial discharge
5 facilities within 10 miles reported 115 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
10 federal disaster declarations on record for Howard County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
Carroll County is in D2 (severe 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 Ellicott City compares
Scores for nearby Maryland cities on one line, with the average marked.
dashed line = Maryland average (60/100)
Ellicott City scores 45/100 — below the Maryland average of 60/100. It outscores 5 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 Ellicott City's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Copper exceeds the EPA action level of 1.3 mg/L
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 Ellicott City 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 Ellicott City, MD tap water safe to drink?
Ellicott City's water quality earned a grade of D (45/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #98 out of 107 cities tested in Maryland.
What contaminants are in Ellicott City's water?
Lead was measured at 2.0 ppb (90th percentile). 453 violations are on record.
How is Ellicott City'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 Ellicott City?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Ellicott City's water come from?
Ellicott City's water is sourced from Purchased surface water. The city has 7 water systems serving approximately 939 residents.
What health violations has Ellicott City's water system had?
Ellicott City has 56 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 57 violations remain unresolved.
How does Ellicott City's water compare to other cities?
Ellicott City ranks #98 out of 107 cities in Maryland (better than 8% of state cities) and #14000 out of 15382 cities nationally (9th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.