Water Treatment Plant Color Guide
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| Pipe Type | Type of Liquid / Gas | COLOR OF LABEL |
|---|---|---|
| Water Lines: | Raw water | 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 |
Also include an arrow to indicate direction of flow.
To facilitate the identification of piping in plants ad pumping stations it is recommended that the following
color scheme be utilized:
Water Lines
- Raw or Recycle — Olive Green
- Settled or Clarified — Aqua
- Finished or Potable — Dark Blue
Chemical Lines
- Alum or Primary Coagulant — Orange
- Ammonia — White
- Carbon Slurry — Black
- Caustic — Yellow with Green Band
- Chlorine (Gas or Solution) — Yellow
- Chlorine Dioxide — Yellow with Violet Band
- Fluoride — Light Blue with Red Band
- Lime Slurry — Light Green
- Ozone — Yellow with Orange Band
- Phosphate Compounds — Light Green with Red Band
- Polymers and Coagulant Aids — Orange with Green Band
- Soda Ash — Light Green with Orange Band
- Sulfuric Acid — Yellow with Red Band
- Back Wash Waste — Light Brown
- Sludge — Dark Brown
- Sewer — Dark Gray
Other
- Compressed Air — Dark Green
- Gas — Red
- Other Lines — Light Gray
In situations where two colors do not have sufficient contrast to easily differentiate between them, a six-inch band of contrasting color should be on one of the pipes at approximately 30-inch intervals. The name of the liquid or gas should also be on the pipe. I some cases it may be advantageous to provide arrowsindicating the direction of flow.