National Water Conditions

U.S. Geological Survey
Environment Canada Climate Information Branch

pH of Precipitation for November 26, - December 23, 2001

Current pH data shown on the map ( 4.9) are precipitation-weighted means caculated from preliminary laboratory results provided by the NADP/NTN Central Analytical Laboratory at the Illinois State Water Survey and are subject to change. The 190 points () shown on this map represent all sites which were in operation during the reporting period.A notation of D instead of a pH value at a site indicates that there was no precipitation; a notation of M indicates that data for the site did not meet preliminary screening criteria for this provisional report.

A list of the approximately 190 sites comprising the total Network and additional data for the sites are available from the NADP/NTN Coordination Office, Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61880.

On-line data and reports on acid rain
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