Healthy People in a Healthy Environment

Public Water System Notices

Public water systems are comprised of three categories.

  1. Community Water Systems are defined as a water system which consists of at least 15 residential service connections or at least 25 “year-round” residents.  Some examples include Harford County Public Water, Bel Air Public Water, Aberdeen Public Water, and Havre de Grace Public Water systems.
  2. Non-Transient Non-Community Water Systems are defined as a water system which consists of at least 25 of the same people at least 4 hours per day, 4 days per week, for at least 6 months of the year.  Some examples include schools, day care centers, and large shopping centers whose water supply is located on the facility’s property.
  3. Transient Non-Community Water Systems are defined as a water system which consists of at least 25 people present for at least 60 days of the year.  This population of people may change on a daily basis.  Some examples of this category include restaurants, parks, churches, and small shopping centers.

The first two categories are regulated by the Maryland Department of the Environment, however, the third category is regulated locally by the Harford County Health Department.

The Harford County Health Department regulates approximately 175 Transient Non-Community Public Water Systems.  Each system is responsible for monitoring and reporting its water quality on a regular basis to the Health Department.

If a public water system violates a water quality provision of COMAR 26.04.01, a violation letter may be issued which requires public notification of the violation committed.  Common violations which require public notification include, but are not limited to:

  1. E. coli bacteria detected in a treated distribution system water sample.
  2. E. coli bacteria detected in a raw water sample.
  3. Total Coliform bacteria detected in a distribution system water sample.
  4. Nitrates above the Maximum Contaminant Level of 10 mg/L in a water sample.
  5. The system failed to conduct the required monitoring of their water quality.

In order to better inform the public, the Harford County Health Department will post a copy of the applicable Public Notice when a violation occurs at one of our regulated Transient Non-Community Water Systems until the violation is corrected.  If no violations are posted in the section below, all of the public water systems monitored by the Health Department are presently in full compliance with their requirements.

Should you have any questions regarding public water systems regulated by the Maryland Department of the Environment please contact the Water Supply Program of MDE at (410)537-3706.

Should you have any questions regarding public water systems regulated by the Harford County Health Department please contact the Environmental Water Quality Division at (410)877-2302.