Figure: 30 TAC §290.42(d)(13)(A)
| LETTERS | COLOR OF PIPE |
| Potable Water | Light Blue |
| Compressed Air | Light Green |
| Instrument Air | Light Green with Dark Green Bands |
| Chlorine (gas, liquid, or vent) | Yellow |
| Chlorine (solution) | Yellow with Red Bands |
| Liquid Alum | Yellow with Orange Bands |
| Alum (solution) | Yellow with Green Bands |
| Ammonia | Yellow with Brown Bands |
| Chlorine Dioxide (solution) | Yellow with Blue Bands |
| Ferric chloride | Brown with Red Bands |
| Ferric sulfate | Brown with Yellow Bands |
| Polymers | White with Green Bands |
| Liquid caustic | White with Red Bands |
| Caustic (solution) | White with Orange Bands |
| Fluoride | White with Yellow Bands |
| Ozone | Stainless Steel with White Bands |
| Settled Water | Green |
| Filter Effluent | Light Blue |
| Backwash Supply | Light Blue |
| Backwash Waste | Dark Grey |
| Drain | Dark Grey |
| Raw Water | Tan |