Gotta agree w/ most of the rest on this one. The levels do tend to vary throughout the different boros. (all NYC water doesen't have the same source).
"All surface water and groundwater entering New York
City’s distribution system is treated with chlorine, fluoride,
food grade phosphoric acid and, in some cases, sodium
hydroxide. New York City uses chlorine to meet the New
York State Sanitary Code and federal Safe Drinking Water
Act (SDWA) disinfection requirements. Fluoride, at a
concentration of one part per million, is added to help
prevent tooth decay and has been added since 1966 in
accordance with the New York City Health Code. Phosphoric
acid is added to create a protective film on pipes that
reduces the release of metals such as lead from household
plumbing. Sodium hydroxide is added to Catskill/Delaware
water to raise the pH and reduce corrosivity."
If you care to read the report (it's like 20pgs.) http://nyc.gov/html/dep/pdf/wsstate07.pdf This for 2007 w/ past reports available. "T"
"All surface water and groundwater entering New York
City’s distribution system is treated with chlorine, fluoride,
food grade phosphoric acid and, in some cases, sodium
hydroxide. New York City uses chlorine to meet the New
York State Sanitary Code and federal Safe Drinking Water
Act (SDWA) disinfection requirements. Fluoride, at a
concentration of one part per million, is added to help
prevent tooth decay and has been added since 1966 in
accordance with the New York City Health Code. Phosphoric
acid is added to create a protective film on pipes that
reduces the release of metals such as lead from household
plumbing. Sodium hydroxide is added to Catskill/Delaware
water to raise the pH and reduce corrosivity."
If you care to read the report (it's like 20pgs.) http://nyc.gov/html/dep/pdf/wsstate07.pdf This for 2007 w/ past reports available. "T"