""Hazmat will do additional studies to identify the substance," Muschlitz said. "But at this time we do know it's not toxic."
Sorry, but that does not instill confidence. The original call was because it smelled like paint thinner, but litmus paper says it's not toxic. Toxicity can be ruled out with Ph?
OK, who dumped what?

All day yesterday I smelled the most foul odor everywhere I went in Lancaster.It smelled like fermented sewage. It hung in the atmosphere like a damp cloud .

Who should I call to report this?

It may not be very healthy for us to breathe.

Who knows what could happen if it entered our water supply.