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From Recommended Standards for Water Works and Recommended Standards for Wastewater Facilities (The "Ten States Standards")

WATER TREATMENT PLANT COLOR CODING

TYPE OF PIPE
USE OF PIPE
COLOR OF PIPE
Water Lines: Raw water
Olive Green
Settled or clarified water Aqua
Finished or potable water Dark Blue
Chemical Lines: Alum or primary coagulant Orange
Ammonia White
Carbon slurry Black
Caustic Yellow w/ green band
Chlorine gas or solution Yellow
Fluoride Light blue w/ red band
Lime slurry Light green
Ozone Yellow w/ orange band
Phosphate compounds

Light green w/ red band

Polymers or coagulant aids Orange w/ green band
Potassium permanganate Violet
Soda ash Light green w/ orange band
Sulfuric Acid Yellow w/ red band
Sulfur Dioxide Light green w/ yellow band
Waste Lines: Backwash waste Light Brown
Sludge Dark Brown
Sewer (sanitary or other) Dark Gray
 
Other Lines: Compressed Air Dark Green
Gas Red
Other Pipes Light Gray


Wastewater Treatment Plant Color Coding

TYPE OF PIPE
USE OF PIPE
COLOR OF PIPE
Sludge Lines: Raw Sludge Brown w/ black bands
Sludge recirculation or suction Brown w/ yellow bands
Sludge drw off Brown w/ orange bands
Sludge recirculation discharge Brown
Gas Lines: Sludge Gas Orange (or Red)
Natural Gas Orange (or Red) w/ Black bands
Water Lines: Nonpotable Water Blue w/ black bands
Potable Water Blue
Water for heating digestors or buildings Blue with a 6 in. (150mm) red band space 30 in. (760mm) apart
Other Lines: Chlorine Yellow
Sulfur Dioxide Yellow w/ Red bands
Sewage (wastewater) Gray
Compressed Air Green

It is also suggested that the direction of flow and name of the contents be noted on all lines...

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