01The verdict: is Harrington water safe?
Harrington's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (80.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 6 water systems serve approximately 3,875 residents using groundwater (wells).
25 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 ↓1 violation 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 ↓Harrington's drinking water received a grade of B+ (80.8 out of 100), indicating good water quality. The city's 6 water systems serve approximately 3,875 residents using groundwater.
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 38 violations on record, including 7 health-based violations. 25 remain unresolved.
Harrington ranks #17 out of 40 cities in Delaware for water quality, placing it mid-range in the state. Harrington 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.
02What's in Harrington's water
Every contaminant flagged in Harrington, 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 Delaware
Cities ranked by compounds detected Cu Copper in Delaware
Cities ranked by 90th-percentile copper
03Harrington'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 38 violations on record, including 7 health-based violations. 25 remain unresolved.
8 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 (2025) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Harrington's water comes from
Harrington's drinking water is drawn from underground aquifers through wells.
Groundwater
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.
6 systems
6 water systems, operated under local government ownership.
3,875 people
Residents served across Harrington'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 local government ownership and serves approximately 3,875 people through 6 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| HARRINGTON WATER DEPARTMENT | DE0000126 | 3,562 | Groundwater |
| MESSICK'S MHC LLC SYSTEM 5 | DE0020065 | 97 | Groundwater |
| MESSICK'S MHC LLC SYSTEM 4 | DE0020064 | 72 | Groundwater |
| MESSICK'S MHC LLC SYSTEM 6 | DE0020066 | 63 | Groundwater |
| MESSICK'S MHC LLC SYSTEM 3 | DE0020063 | 45 | Groundwater |
| MESSICK'S MHC LLC SYSTEM 2 | DE0020062 | 36 | Groundwater |
Water bodies near Harrington
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Harrington'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
3 facilities within 10 miles reported 0 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
8 federal disaster declarations on record for Kent County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
Kent 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 Harrington compares
Scores for nearby Delaware cities on one line, with the average marked.
dashed line = Delaware average (75/100)
Harrington scores 80.8/100 — above the Delaware average of 75/100. It outscores 9 of 10 nearby cities. Full Delaware rankings →
80.5 / 100BWilmington, DE
79.5 / 100BMillville, DE
76.4 / 100CNewark, DE
56.5 / 100BDover, DE
75.3 / 100CDewey Beach, DE
66.8 / 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 Harrington's water — not generic advice.
A basic carbon filter still helps
Harrington'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 Harrington 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 Harrington, DE tap water safe to drink?
Harrington's water quality earned a grade of B+ (80.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #17 out of 40 cities tested in Delaware.
What contaminants are in Harrington's water?
Lead was measured at 0.0 ppb (90th percentile). 38 violations are on record.
How is Harrington'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 Harrington?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Harrington's water come from?
Harrington's water is sourced from Groundwater. The city has 6 water systems serving approximately 3,875 residents.
What health violations has Harrington's water system had?
Harrington has 7 health-based violations on record. The most recent violation was recorded in October 2021. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 25 violations remain unresolved.
Is Harrington's groundwater at risk of contamination?
Harrington 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 38 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 Harrington's water compare to other cities?
Harrington ranks #17 out of 40 cities in Delaware (better than 57% of state cities) and #7618 out of 15382 cities nationally (51th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.