16 NYCRR 753-4.7
753-4.7 Uniform color code.
The following uniform color code shall be utilized for staking and marking used to designate the location of underground facilities and excavation sites:
(a) Yellow-gas, oil, petroleum products, steam, compressed air, compressed gases and all other hazardous liquid or gaseous materials except water.
(b) Red-electric power lines or conduits.
(c) Orange-communication lines or cables, including but not limited to telephone, telegraph, fire signals, cable television, civil defense, data systems, electronic controls and other instrumentation.
(d) Blue-water.
(e) Green-storm and sanitary sewers including force mains and other nonhazardous materials.
(f) Purple-radioactive materials, reclaimed water, irrigation and slurry line.
(g) White-excavation site.
(h) Pink-survey markings.