Swimmer profile
Declan Costello
Male15-16All Star AquaticsPV · EASTERN
SeasonUSA Swimming season runs Sept – Aug
Event
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free LCM
36.27
34.31
▲ 1.96
31.39
▲ 2.92
30.30
▲ 1.09
28.22
▲ 2.08
26.53
▲ 1.69
100 Free LCM
1:21.88
1:15.43
▲ 6.45
1:07.29
▲ 8.14
1:04.00
▲ 3.29
1:01.73
▲ 2.27
58.03
▲ 3.70
200 Free LCM
—
2:44.83
2:26.66
▲ 18.17
2:17.58
▲ 9.08
2:09.75
▲ 7.83
2:02.96
▲ 6.79
400 Free LCM
—
5:57.50
5:15.82
▲ 41.68
4:49.79
▲ 26.03
4:39.47
▲ 10.32
4:16.03
▲ 23.44
800 Free LCM
—
—
—
10:25.05
9:36.62
▲ 48.43
8:51.97
▲ 44.65
1500 Free LCM
—
—
—
19:17.25
18:11.09
▲ 66.16
16:59.40
▲ 71.69
50 Back LCM
44.27
41.99
▲ 2.28
38.07
▲ 3.92
—
—
—
100 Back LCM
—
1:31.14
1:20.25
▲ 10.89
1:16.31
▲ 3.94
1:11.86
▲ 4.45
—
200 Back LCM
—
—
—
2:38.45
2:35.77
▲ 2.68
—
50 Breast LCM
47.86
46.17
▲ 1.69
41.72
▲ 4.45
—
34.82
▲ 6.90
33.49
▲ 1.33
100 Breast LCM
1:48.35
1:45.41
▲ 2.94
1:36.63
▲ 8.78
1:26.73
▲ 9.90
1:16.13
▲ 10.60
1:16.95
▼ 0.82
200 Breast LCM
—
3:42.20
3:30.58
▲ 11.62
—
2:50.47
▲ 40.11
—
50 Fly LCM
48.82
44.71
▲ 4.11
40.16
▲ 4.55
—
—
—
100 Fly LCM
—
—
—
—
1:15.57
—
200 Fly LCM
—
—
—
—
2:55.02
—
200 IM LCM
—
3:18.55
—
2:35.67
▲ 42.88
2:27.99
▲ 7.68
2:18.96
▲ 9.03
400 IM LCM
—
—
—
—
5:08.65
5:03.15
▲ 5.50
Improvement<0.5s0.5–2s2–5s5s+Slower
📊 All Attempts by Event
Chronological history of every recorded swim. Click an event to expand its attempt list.