Contamination concerns surrounding Air Force and other military sites span far beyond PFAS as well. Disused military sites fall under the purview of the Defense Environmental Recovery Program/Formerly Used Defense Sites (DERP FUDS, what an acronym) administered by the Corps of Engineers, which has a long list of sites (hundreds per state generally) and is not very transparent about the disposition of these sites, with the records usually being shipped to the district ACE headquarters from which they can be difficult to retrieve. The sheer number of sites is also a challenge to effective public oversight.
Active sites generally fall under the purview of an environmental permitting program, so there are dual problems that the level of rigor to which the operation is held varies by the permitting authority (state environment department or EPA depending) and that the military branches in general and it seems Air Force in particular have drug their feet and, in general, gotten away with the least effort possible to satisfy their permit obligations (which are virtually always negotiable with the permitting authority, a negotiating process in which the Air Force holds a large portion of the power).
Other common groundwater contamination concerns around Air Force installations include jet fuel (often leaked from underground tanks and piping and may have gone undetected for decades) and residues of high explosives resulting from munitions testing and disposal. Smaller groundwater plumes may result from photographic processing chemicals and solvents used in cleaning aircraft parts. Generally all of these will be grouped into one or more "operable units" or OUs for administrative purposes and a series of reports issued as the contamination is characterized and a remediation program is designed and implemented. Depending on the regulating agency, these reports may be more or less difficult to find. For DERP FUDS it usually requires a FOIA to the correct USACE HQ wih a lot of followup as they frankly don't seem to have their records in order internally and take a while to find them - the FOIA officers are generally helpful but will keep coming back to you needing more info/clarification as they try to track down the right OU and reports. Fortunately I have never had them ask for a fee, even when their "secure file transfer" solution was broken for months and they had to mail me burned CDs.
Permitting processes and the DERP program both require public information meetings and a (modest) public outreach program. If you live near a military site, pay attention to notices in the newspapers and posted around the community for these meetings, and contact the public information office of the relevant military branch to inquire. The public meetings often include a surprising amount of technical detail on the concern and remediation plans, and because they are also attended by permitting officials represent an opportunity to put some city council meeting-style public pressure on the process.