Central Point's tap-end TTHM running average (23.3 ppb) is higher than the number measured entering the distribution system (17.1 ppb) because chlorinated DBPs keep forming as water moves through the mains (Medford Water 2024 CCR).
Point-of-use carbon filtration is the most efficient way to push that number back down where you actually drink it. Some of the city's water infrastructure dates to the early 1900s (City of Central Point — Water), another reason for a final polish at the tap.