Article says 300 gallons per minute, which shakes out to 432,000 gallons per day, to be purchased from Spring Tsp Water Authority. The water authority draws from a 24-acre reservoir on trout stream Kern Run, a trib to Middle Creek.
Spring Township Water Auth. serves about 1,000 people (http://www.elibrary.dep.state.pa.us/dsweb/Get/Document-59524/RS4550011001%20Spring%20Twp.pdf) and typically water resources organizations plan for 180 gallons of water per day per person, or current need of probably closer to 200,000 gallons than the straight math figure of 180,000 because of leaks, fire hydrant uses and such.
Kern Run looks to be pretty tiny, maybe 5 cubic feet per second (37 gallons per second ) or less in summertime (5 cfs X7 .48 gallons per cubic foot=37 gallons per second). Math (37ish gallons per secondX60 seconds per minute X 60 minute per hour X 24 hours) would shake out to 3.1968 million gallons per day in the creek.
That would put the residents needs plus the company's wants at about 600,000 to 630,000 gallons per day, or about, and very roughly, 15 to 18 percent of the total creek (presuming the 5 cubic feet per second estimate is accurate).
Not sure what this means for any trout fishing that goes on in Kern Run, but below the reservoir, I wouldn't count on the stream flowing fast and cold throughout the summer months.