Keystone Postmaster Grid, FL
Lead detected, under the action levels
Latest 90th-percentile lead: 2.3 ppb (monitoring period 2023-2023). 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.
About Keystone Postmaster Grid
Keystone Postmaster Grid serves about 5,092 people through 1,845 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Clay County, Florida. EPA system ID: FL2100610; phone on file: 904-213-2477. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 1.8 ppb from 0.5 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Keystone Postmaster Grid is 2.3 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 2.3 ppb |
| 2020 | 0.5 ppb |
| 2017 | 0.7 ppb |
Against other Florida systems
Of the 1,481 Florida systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 85 have gone over at some point. Keystone Postmaster Grid's 2.3 ppb sits at the 76th percentile in Florida and the 76th nationally (higher means more lead).
Nearby utilities
10 other systems share Clay County; 2 of them have a higher latest lead result than Keystone Postmaster Grid. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Orange Park Grid | 127,904 | 0.8 ppb |
| Lake Asbury Grid | 27,001 | 0.7 ppb |
| Town Of Orange Park | 8,668 | 0.7 ppb |
| City Of Green Cove Springs Wtp | 7,000 | 0.5 ppb |
| Camp Blanding Joint Training Center | 900 | 1.4 ppb |
| Town Of Penney Farms Wtp | 489 | 5.1 ppb |
| Penney Retirement Community | 450 | 9.8 ppb |
| Pier Station Wtp | 270 | 0 (not detected) |
| Kingsley Cove | 196 | 1.1 ppb |
| Lake Geneva Mhp | 95 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Middleburg, FL 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 Keystone Postmaster Grid 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. Systems that went over once often dip back under; here is what that means.