Pforzheimer House Superintendent Milton A. Canjura sent an email message out over the House's email list warning students of the potentially discolored water.
"Don't be alarmed, just be wary," he said. "I'd be careful washing clothes today."
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Yeo said the MWRA had taken extra steps in recent years to upgrade its water mains, but said things were bound to break.
"This happens a couple of times a year," he said.
--Staff writer Parker R. Conrad can be reached at conrad@fas.harvard.edu.