Miami-Dade County -- and Sierra Club -- played an important role in defining federal regulations of the Safe Drinking Water Act in the 1990's and early 2000's, when the Club (that I represented, as an activist leader) sued to prevent the EPA from changing its rule to allow the migration of injected fluids from one underground layer to another.
As ProPublica notes, that leakage was happening in the case of the wells where most of our (now treated to advance wastewater requirements) sewage disappears, right by Biscayne National Park and under the massive landfill in South Dade. This case was my first exposure to the 11th Circuit, that ruled on the Sierra Club appeal. Their outright disdain for the environmental plaintiffs was shocking to me. This dismal affair took several years to unwind, and among the more distasteful memories is that we simply couldn't raise enough money for adequate lawyers and engineers to make our case. We were buried in a blizzard of paper.
ProPublica gets the facts straight but ought to have examined the importance of the Sierra Club lawsuit, which the Club lost, that subsequently permitted the natural gas industry to use fracking as a way to free profits from deep underground, all over the country.
This issue was also one of the unreported skirmishes between environmentalists and Jeb! Bush, who ordered his lieutenants to throttle any public release of information and data about the massive extent of underground injection wells in the state of Florida.