Keesler Air Force Base, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 1.1 ppb (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Keesler Air Force Base serves about 8,006 people through 2,127 service connections, which makes it a medium-sized system under EPA's size classes. It is federally owned and draws groundwater, in Harrison County, Mississippi. EPA system ID: MS0240049; phone on file: 228-376-8417. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2023 (1.9 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Keesler Air Force Base is 1.9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.1 ppb |
| 2023 | 1.9 ppb |
| 2020 | 1 ppb |
| 2017 | 1.2 ppb |
Where this result ranks
Of the 973 Mississippi systems with a lead result, the median latest reading is 1 ppb; 9 are over 15 ppb right now and 44 have gone over at some point. Keesler Air Force Base's 1.1 ppb sits at the 56th percentile in Mississippi and the 57th nationally (higher means more lead).
Neighbouring systems
24 other systems share Harrison County; 9 of them have a higher latest lead result than Keesler Air Force Base. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Gulfport | 75,056 | 1.5 ppb |
| City Of Biloxi | 23,310 | 1 ppb |
| City Of Long Beach | 18,514 | 2.9 ppb |
| Diberville W/S | 12,721 | 1.6 ppb |
| City Of Pass Christian | 10,436 | 1 ppb |
| City Of Biloxi-North | 9,858 | 1.1 ppb |
| City Of Biloxi-French | 4,968 | 0.7 ppb |
| Riverbend Utilities Inc | 4,834 | 5.1 ppb |
| Naval Construction Battal Ctr | 3,347 | 2 ppb |
| Saucier Utilities | 1,853 | 1.03 ppb |
Next steps for Biloxi, MS
Test your own tap with a certified lab first-draw sample; Biloxi, MS may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Keesler Air Force Base whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.