What to Know About Philly's Tap Water After Chemical Spill

The chemicals are all known to be respiratory and skin irritants, above certain levels. However, less is known what impacts these chemicals have on human health when ingested, particularly with short-term exposure,

, a toxicologist and environmental health researcher at Johns Hopkins University, told Gizmodo by phone.The Environmental Protection Agency has established a reference dosage for one of the three compounds, methyl methacrylate, which is considered the safe threshold for regular exposure. Based on that EPA reference dosage , a person would need to ingest a lot of methyl methacrylate to experience adverse health effects.

Ingestion symptoms for all three chemicals may include abdominal pain, nausea, vomiting, and diarrhea, according to the National Institutes of Heath’s PubChem. Yet Nachman pointed out that the city of Philadelphia hasn’t released enough information to assess whether or not those are symptoms people could potentially face in the current scenario. To accurately assess risk, Nachman said he would need to know what level of each chemical is circulating in the river water, if any.

Yet even with the unknowns, he seemed optimistic that this spill likely won’t cause serious harm. Usually, health impacts of water pollution are assessed over the long term, Nachman explained. If any contamination does manage to enter the water supply, it is likely to be a less dangerous, short-term exposure, he said. “It may be the case that people are not exposed long enough for us to be concerned about drinking water.

Additionally, given the size of the spill, chemical concentrations in the water are likely to be very low. The 8,000+ gallons spilled is tiny, relative to the amount of water in the Delaware River as it passes through Philadelphia. For context, more than 1 million gallons flow through the waterway per second at

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