By 1999, after the clean water act had been passed in 1970, the percentage of u.s. surface waters safe for fishing and swimming had increased from 36 percent to _____.
Almost 30 years after the clean water act was passed in the US, the percentage of surface water considered safe for fishing and swimming had increased from 36% to 60% which is almost twice the original value. Certain programs and policies were implemented as part of the act.
