This is not a pollution problem. However, orange water can indicate acidic runoff from mining activities. Acid water kills fish and other stream life. Foam or Suds - Some foam or suds in the stream is natural. If you see foam in the stream that is more than three inches tall, looks like bubble bath and doesn't break apart easily, detergent may be in the stream.
Soap can come from people's homes, factories or car washes.
Soap harms stream critters because it breaks the surface tension of the water and insects, like water striders, sink and drown. Strange Odors - A chemical smell can mean harmful chemicals are polluting your stream. A rotten egg smell can mean sewage is getting into the stream from cows, sewage treatment plants, or people's homes. Sewage or chemicals can make people and animals sick.