The book

League records

Best-ever observed time per event across all loaded seasons. 28 events with at least one recorded swim matching your filter.

Age group5-6 7-8 9-10 11-12 13-14 15-18

GenderGirls Boys

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How records work here

Each entry is the fastest legal time ever recorded for that event in the loaded data — across every ISL Championship PDF we've parsed. Records carrying multiple seasons of daylight get a Standing chip; records set this season get New. ISL is the ultimate authority on the official book — we display what the published results show.

Records in book

matching your filter

Oldest standing

18y

Ella Eastin, 2007

Age 5-6

Event	Holder	Time	Margin	Set
Girls 5-6 25 Backstroke	Linda Jiang NPF	19.35	+1.15s	2025New
Girls 5-6 25 Breaststroke	Linda Jiang NPF	22.00	+0.02s	2025New
Girls 5-6 25 Butterfly	Grace Wang PS	17.16	+0.80s	20214y
Girls 5-6 25 Freestyle	Emily Jiang NPF	16.35	+0.32s	2024New

Age 7-8

Event	Holder	Time	Margin	Set
Girls 7-8 25 Backstroke	Tina Tang WBY	17.00	+0.41s	20223y
Girls 7-8 25 Breaststroke	Johanna Toney WP	19.15	+0.15s	20232y
Girls 7-8 25 Butterfly	Hope Heumann DF	15.58	+0.05s	20223y
Girls 7-8 25 Freestyle	Maya Nishizaka WB	14.74	+0.02s	20169y

Age 9-10

Event	Holder	Time	Margin	Set
Girls 9-10 100 IM	Ella Eastin NPR	1:05.02	+1.71s	200718y
Girls 9-10 50 Backstroke	Tina Tang WBY	31.42	+0.74s	2024New
Girls 9-10 50 Breaststroke	Hope Heumann DF	33.16	+0.93s	2024New
Girls 9-10 50 Butterfly	Ella Eastin NPR	28.63	+1.03s	200718y
Girls 9-10 50 Freestyle	Tina Tang WBY	27.01	+0.05s	2024New

Age 11-12

Event	Holder	Time	Margin	Set
Girls 11-12 100 IM	Anna Heumann DF	1:00.08	+2.90s	2024New
Girls 11-12 50 Backstroke	Sydney Okubo WB	28.70	+0.16s	201213y
Girls 11-12 50 Breaststroke	Anna Heumann DF	31.00	+0.86s	2024New
Girls 11-12 50 Butterfly	Erin Li DF	26.45	+1.09s	2025New
Girls 11-12 50 Freestyle	Ariel Lin QH	25.08	+0.38s	20196y

Age 13-14

Event	Holder	Time	Margin	Set
Girls 13-14 100 IM	Anna Heumann DF	59.22	+0.43s	2025New
Girls 13-14 50 Backstroke	Ella Eastin NPR	27.30	+0.19s	201015y
Girls 13-14 50 Breaststroke	Anna Heumann DF	30.37	+0.86s	2025New
Girls 13-14 50 Butterfly	Zara Masud WP	25.80	—	20214y
Girls 13-14 50 Freestyle	Holly Fishburn WB	24.50	+0.02s	2024New

Age 15-18

Event	Holder	Time	Margin	Set
Women 15-18 100 IM	Zara Masud WP	58.44	+0.42s	2024New
Women 15-18 50 Backstroke	Malia Allen PS	26.84	+0.06s	20178y
Women 15-18 50 Breaststroke	Kate Lee CLR	30.06	+0.37s	20178y
Women 15-18 50 Butterfly	Zara Masud WP	25.07	+0.54s	2024New
Women 15-18 50 Freestyle	Ariel Lin QH	23.81	+0.13s	20223y

14 records set or matched in the most recent season.