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²¹⁰Bi (t_1/2: 5.01 d)—the daughter of²¹⁰Pb and parent of²¹⁰Po—has rarely been measured in aquatic systems, and its behavior in the water column is poorly understood. In this article, I present a method for quickly measuring²¹⁰Pb,²¹⁰Bi, and²¹⁰Po in aquatic samples, where (1)²¹⁰Bi and²¹⁰Po are scavenged onto an anion solid‐phase extraction disk within 15 min of pretreating the sample; (2) beta decay of²¹⁰Bi is counted on the disk immediately thereafter; (3)²¹⁰Po is subsequently removed from the disk and redeposited on a copper plate for α‐spectroscopy; and (4)²¹⁰Pb is determined via the ingrowth of²¹⁰Bi. I present decay‐corrected calculations for total, dissolved, and particle‐bound fractions of each nuclide and conclude with an analysis of²¹⁰Pb,²¹⁰Bi, and²¹⁰Po activities in rain,dreissenid(quagga) mussels, and water samples from the Milwaukee Inner Harbor in Lake Michigan. Results show that the loss of lead on the anion solid‐phase extraction disks was negligible (0.2% ± 2.1%; ± 1 SD,n= 4), and the sorption of bismuth was complete (99% ± 2%; ± 1 SD,n= 16). Relative mean absolute deviations of duplicate sample analyses of lake water were 2.4% ± 1.9% for²¹⁰Pb (geometric mean of total sample activity: 3.0 disintegrations per minute [dpm],n= 6), 7.7% ± 5.8% for²¹⁰Bi (geometric mean of total sample activity: 2.6 dpm,n= 8), and 2.7% ± 1.7% for²¹⁰Po (geometric mean of total sample activity: 1.4 dpm,n= 8).