Adding Chemicals to Water Supply - Permit



Health and Mental Hygiene, Department of City
The Adding Chemicals to Water Supply permit is required for persons who engage in the business of chemically treating the drinking water supply within a building. This permit allows chemicals to be added only for anti-corrosion or anti-scaling purposes.

Please note that chemicals can only be added to drinking water in a building by an approved permittee or by a trained and qualified employee of a permittee. Chemicals can be added to drinking water only by means of a device which is approved the City Board of Standards and Appeals and meets all regulatory requirements, including sampling and analyzing the contents of the samples and records of the analysis of these samples shall be kept on file for at least two years. 

Chemicals for anti-corrosion or anti-scaling purposes so as to increase the total alkalinity, total hardness or total silica content of the water by more than 50 ppm cannot be added to drinking water. The only chemicals which may be added to the drinking water supply of a building are sodium silicates, sodium carbonate, sodium bicarbonate, sodium hydroxide, sodium phosphates, calcium carbonate, calcium hydroxide or equally effective and safe chemicals approved by DOHMH.

Next: Apply

NYC Department of Health and Mental Hygiene (DoHMH)
Office of Public Health Engineering/Building Water Supply
25-01 Jackson Avenue
Long Island City, NY 11101
Phone: (718) 310-2850

Learn which permits, licenses and regulations matter to you

Use the Step by Step tool to get an exhaustive list of requirements that matter to you.