1. (a) Water systems will be classified into one of five classifications being designated as Classification A, B, C, D or E as follows:

   1. (1) Classification A. Water systems serving an average of more than 5 million gallons per day.
   2. (2) Classification B. Water systems serving an average of greater than 1 million gallons per day but less than or equal to 5 million gallons per day.
   3. (3) Classification C. Water systems serving an average of greater than 100,000 gallons per day but less than or equal to 1 million gallons per day.
   4. (4) Classification D. Water systems serving an average of less than or equal to 100,000 gallons per day.
   5. (5) Classification E. Distribution and consecutive water systems, without treatment.
2. (b) Upon written request by the owner, the Department may reclassify a water system serving no more than 500 individuals or having no more than 150 connections, where the source of water for the system is exclusively groundwater, as a Dc water system. A water system that requires only disinfection will be classified as a Dc system.

3. (c) Each water system Classification A, B and C must be assigned one or more of the following 14 treatment subclassifications that identifies the treatment methods used to process water at that system. Classifications D and E may have one or more of the following 14 treatment subclassifications if the system or operator uses the specified treatment methods to process drinking water at that system.

   1. (1) Subclassification 1—Conventional Filtration.
   2. (2) Subclassification 2—Direct Filtration.
   3. (3) Subclassification 3—Diatomaceous Earth Filtration.
   4. (4) Subclassification 4—Slow Sand Filtration.
   5. (5) Subclassification 5—Cartridge or Bag Filtration.
   6. (6) Subclassification 6—Membrane Filtration.
   7. (7) Subclassification 7—Corrosion Control and Sequestering.
   8. (8) Subclassification 8—Chemical Addition.
   9. (9) Subclassification 9—Ion Exchange and Greensand.
   10. (10) Subclassification 10—Aeration and Activated Carbon Adsorption.
   11. (11) Subclassification 11—Gaseous Chlorine Disinfection.
   12. (12) Subclassification 12—Nongaseous Chemical Disinfection.
   13. (13) Subclassification 13—Ultraviolet Disinfection.
   14. (14) Subclassification 14—Ozonation.

4. (d) Upon written notice provided to the owners and available operators of the system, the Department may change the classification or subclassification of a water system because of changes in the conditions or circumstances at the system, including, but not limited to:

   1. (1) An increase in capacity that changes the class of the system.
   2. (2) The addition or loss of a treatment technology.
   3. (3) Other Federal or State regulatory changes in requirements relating to the treatment technology used at the system.
   4. (4) The issuance of a permit changing the class or subclassification of a system.

Cross References

This section cited in 25 Pa. Code § 302.1002 (relating to certification classes and subclassifications of water system operators); and 25 Pa. Code § 302.1206 (relating to operator in responsible charge).