Emergency pumping into Lake Okeechobee has ended, lessening South Florida flooding risks but creating a water pollution threat that could eventually spread to coastal waters. Concerns about rising waters in western Broward and Miami-Dade counties last month triggered emergency pumping south into Everglades National Park as well as north into Lake Okeechobee. The draining to the south continues, while water levels have dropped enough to stop the pumping into Lake Okeechobee, according to the South Florida Water Management District. About 9.4 billion gallons of potentially polluted water was pumped from a reservoir in southwestern Palm Beach County into Lake Okeechobee from June 24 through Wednesday. That’s enough water to fill more than 14,000 Olympic-size swimming pools, or meet Fort Lauderdale’s public water supply needs for more than six months. While the emergency pumping helped reduce rising Everglades waters in western Broward and Miami-Dade counties, it also risked sending fertilizers and other pollutants that wash off South Florida land into the lake. “We know a lot of stuff has gone into the lake … a lot of stuff we…