YORK, Pennsylvania Tap Water Quality

What this violation means

Nitrate contamination is most acute in agricultural regions where fertilizer and animal waste leach into groundwater. The immediate risk is to formula-fed infants under 6 months — high nitrate levels prevent their blood from carrying oxygen, causing 'blue baby syndrome.' Pregnant women should also avoid high-nitrate water.

Recommended precautions

• →Never give untreated high-nitrate water to infants — use bottled water for formula.
• →Boiling does NOT remove nitrate. Boiling concentrates it.
• →Reverse osmosis, ion exchange, or distillation are the only effective home treatments.
• →Private well owners in farming areas should test annually for nitrate.

What this violation means

Arsenic is a known human carcinogen that occurs naturally in groundwater across many parts of the United States, especially the Southwest and parts of New England. Long-term exposure even at low levels has been linked to bladder, lung, and skin cancer, as well as cardiovascular disease and developmental effects in children.

Recommended precautions

• →Reverse osmosis filtration removes arsenic effectively.
• →Distillation also removes arsenic — point-of-use distillers work for drinking and cooking water.
• →Boiling does NOT remove arsenic. It actually concentrates it as water evaporates.
• →If your well water has arsenic, test annually and treat at the point of entry.

What this violation means

Total coliform bacteria are themselves usually harmless, but their presence signals that the water distribution system has a vulnerability — typically a cracked pipe, loss of pressure, or back-siphonage — that could allow disease-causing pathogens to enter. Repeated coliform-positive samples trigger mandatory utility investigation.

Recommended precautions

• →If your utility issues a boil-water advisory, boil all drinking and cooking water for at least one minute.
• →Use bottled water until the advisory is lifted.
• →Ice from icemakers and beverages made before the advisory should be discarded.
• →UV light and chlorination both kill coliform bacteria — most home filters do not.