Public water system · DE0001303
ActiveMountaire-Millsboro
At a glance
Mountaire-Millsboro (PWSID DE0001303) is an active non-transient non-community water system in Sussex County, Delaware. It reports serving 1,200 people through 10 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in October 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
10
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Mountaire-Millsboro compare with other water systems in Sussex County?
By EPA's size categories, Mountaire-Millsboro is a small system (501 to 3,300 people). Sussex County has 246 active public water systems. Its population served is about 23% below the county average of 1,556 people per system, and accounts for 0.3% of the 382,753 people reported by systems filed under the county. Across Delaware, the 494 active systems average 2,238 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Mountaire-Millsboro is about 179% above that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Delaware has 82 active non-transient non-community water systems, 17% of the state's 494 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 459 Delaware systems (93%) list groundwater as their primary source.
Who owns and regulates Mountaire-Millsboro?
EPA lists Mountaire-Millsboro as privately owned. The DE state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 215 of the 246 active systems in Sussex County (87%) are also privately owned.
Does Mountaire-Millsboro have drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in October 2010. The violations listed here began between January 1993 and October 2010. By type: 10 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Nitrate (9 of them). EPA lists 6 as resolved and 6 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2010-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Archived |
| 2007-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1993-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1993-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1993-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1993-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Mountaire-Millsboro: frequently asked questions
Who runs Mountaire-Millsboro?
Mountaire-Millsboro (PWSID DE0001303) is a non-transient non-community water system privately owned. It is regulated by the DE state drinking water program.
How many people does Mountaire-Millsboro serve?
Mountaire-Millsboro reports serving 1,200 people through 10 service connections in Sussex County, Delaware.
Where does Mountaire-Millsboro get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Mountaire-Millsboro have any drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in October 2010. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Mountaire-Millsboro's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in October 2010. For current results, consult EPA ECHO, or the DE state drinking water program.
Where can I find Mountaire-Millsboro's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mountaire-Millsboro is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Sussex County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rehoboth Pump District (Tui) | Sussex | 81,417 | Community | Groundwater |
| Bethany Bay Pump District | Sussex | 51,000 | Community | Groundwater |
| Dewey Beach Water Department | Sussex | 31,000 | Community | Purchased groundwater |
| Rehoboth Beach Water Department | Sussex | 25,000 | Community | Groundwater |
| Artesian Southern Sussex Regional | Sussex | 18,215 | Community | Groundwater |
| Sussex Shores Water Company | Sussex | 12,450 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Mountaire-Millsboro, PWSID DE0001303, Delaware”, https://aquacensus.com/water-systems/delaware/mountaire-millsboro-de0001303 (data as of October 1, 2026).