Eric Leopold, PhD, biochemist in organic chemistry, testified before Calif. municipalities as an expert witness on the environment, to wit; "Evaporation, oxidation, photochemical degradation & ultraviolet light have the combined effect of neutralizing and destroying any bacteria present in urine, which is 98% water. The remaining chemicals of animo acids, vitamins, enzymes, antigens & aimmunoglobulins are unstable in the natural environment of earth/air/light & are rapidly degraded. Dog feces is a non-issue in a self-regulated Dog Park where it is collected by responsible dog owners & deposited in sealed containers. Dog urine is not a threat to humans, nor is it harmful the environment & it has no negative effect on wetlands."

NOTE: There are numerous Dog Parks located adjacent to wetlands/harbor/river areas in Florida, Calif. & Washington State, with a zero effect on the environment. Negative environment impact  is a frequent objection used by dog opponents who do not have the facts. Valid documentation is the best ammunition to silence irrational objections.