| 50m backstroke | Samantha Perry | 36.22 | 2011-03-26 | aged 10 | Herts Major Round 3 |
| 50m breaststroke | Christie Bays | 38.66 | 2007-05-18 | aged 10 | Inter County schools gala |
| 50m butterfly | Jessica Jackson | 36.03 | 2008-03-02 | aged 10 | County Champs Day 2 |
| 50m freestyle | Jessica Jackson | 30.56 | 2008-07-12 | aged 10 | Peanuts League Round 3 |
| 100m backstroke | Samantha Perry | 1:18.65 | 2011-05-08 | aged 10 | Stevenage Open Day 2 |
| 100m breaststroke | Christie Bays | 1:24.29 | 2007-03-23 | aged 10 | Secondary schools gala |
| 100m butterfly | Samantha Perry | 1:29.93 | 2011-05-07 | aged 10 | Stevenage Open Day 1 |
| 100m freestyle | Jessica Jackson | 1:09.41 | 2008-06-15 | aged 10 | ASA East Junior Championships Day 4 |
| 100m individual medley | Christie Bays | 1:19.85 | 2007-07-14 | aged 10 | Bishops Stortford Open |
| 200m backstroke | Samantha Perry | 2:49.79 | 2011-01-23 | aged 10 | Biggleswade Open Day 2 |
| 200m breaststroke | Christie Bays | 3:12.37 | 2007-03-04 | aged 10 | Age Groups Day 2 |
| 200m butterfly | Jessica Jackson | 3:20.37 | 2008-04-27 | aged 10 | Milton Keynes Open |
| 200m freestyle | Jessica Jackson | 2:35.36 | 2008-03-01 | aged 10 | County Champs Day 1 |
| 200m individual medley | Christie Bays | 2:54.85 | 2007-06-10 | aged 10 | ASA East Junior Championships |
| 400m freestyle | Jessica Jackson | 5:30.67 | 2008-05-18 | aged 10 | Kate Lack Gala Barnet Copthall |
| 400m individual medley | Christie Bays | 6:35.64 | 2007-03-10 | aged 10 | Age Groups Day 3 |
| 50m backstroke | Jake Robinson | 37.28 | 2005-06-26 | aged 10 | Potters Bar Open |
| 50m breaststroke | Jake Robinson | 40.70 | 2005-03-12 | aged 10 | Age Groups 5 & 6 |
| 50m butterfly | Liam Doonan | 35.59 | 2007-03-24 | aged 10 | Herts Major League 3 |
| 50m freestyle | Martin Jones | 31.92 | 2000-04-02 | aged 10 | Speedo Junior League round 2 |
| 100m backstroke | Martin Jones | 1:24.08 | 2000-04-08 | aged 10 | Herts Age Groups session 7 |
| 100m breaststroke | Mark Aldwinckle | 1:34.87 | 1996-06-09 | aged 10 | Club championships |
| 100m butterfly | Kieran Watkins | 1:25.27 | 2010-06-13 | aged 10 | ASA East Region BAGCAT Day 4 |
| 100m freestyle | Martin Jones | 1:10.60 | 2000-03-18 | aged 10 | Herts Age Groups session 3 |
| 100m individual medley | Jake Robinson | 1:20.87 | 2005-03-06 | aged 10 | Age Groups 3 & 4 |
| 200m backstroke | Jake Robinson | 2:53.19 | 2005-02-12 | aged 10 | Barnet Copthall 200 meet |
| 200m breaststroke | Jake Robinson | 3:14.21 | 2005-03-05 | aged 10 | Age Groups 1 & 2 |
| 200m butterfly | Kieran Watkins | 3:01.56 | 2010-06-13 | aged 10 | ASA East Region BAGCAT Day 4 |
| 200m freestyle | Jake Robinson | 2:33.00 | 2005-03-20 | aged 10 | Age Groups 9 |
| 200m individual medley | Jake Robinson | 2:53.38 | 2005-03-19 | aged 10 | Age Groups 7 & 8 |
| 400m freestyle | Kieran Watkins | 5:43.14 | 2010-10-16 | aged 10 | Waltham Forest County Qualifier Day 1 |
| 400m individual medley | Kieran Watkins | 6:23.81 | 2010-10-16 | aged 10 | Waltham Forest County Qualifier Day 1 |
| 50m backstroke | Nicola Adams | 33.63 | 1996-03-22 | aged 11 | unknown fixture |
| 50m breaststroke | Christie Bays | 37.15 | 2008-05-10 | aged 11 | Peanuts League Round 1 |
| 50m butterfly | Claire Taylor | 32.54 | 1999-06-26 | aged 12 | Biggleswade Gala |
| 50m freestyle | Claire Taylor | 29.63 | 1999-06-26 | aged 12 | Biggleswade Gala |
| 100m backstroke | Claire Taylor | 1:15.41 | 1999-04-17 | aged 12 | Herts Age Groups 17/4/99 |
| 100m breaststroke | Christie Bays | 1:20.96 | 2008-07-05 | aged 11 | East Region Inter Counties |
| 100m butterfly | Claire Taylor | 1:15.99 | 1999-06-20 | aged 12 | Club Championships round 1 |
| 100m freestyle | Claire Taylor | 1:06.46 | 1999-03-06 | aged 12 | Herts Major League 6/3/99 |
| 100m individual medley | Ruth Pay | 1:15.80 | 2002-03-17 | aged 12 | Age Groups 7 & 8 |
| 200m backstroke | Kirsty Hamshere | 2:46.44 | 2009-05-10 | aged 11 | Stevenage Open |
| 200m breaststroke | Christie Bays | 2:57.43 | 2008-01-26 | aged 11 | Biggleswade Open |
| 200m butterfly | Claire Taylor | 3:12.91 | 1998-12-13 | aged 12 | Club 200 meet |
| 200m freestyle | Hannah Kellet | 2:25.03 | 2000-09-22 | aged 12 | Harlow Open |
| 200m individual medley | Claire Taylor | 2:44.07 | 1999-02-20 | aged 12 | Herts Age Groups 20/2/99 |
| 400m freestyle | Carina Bays | 5:10.97 | 2007-03-04 | aged 12 | Age Groups Day 2 |
| 400m individual medley | Abigail Lence | 6:22.96 | 2011-01-23 | aged 12 | Biggleswade Open Day 2 |
| 800m freestyle | Katie Garstang | 11:22.46 | 2011-03-04 | aged 12 | Herts County Champs Day 1 |
| 50m backstroke | Edward Burrell | 33.62 | 2001-12-08 | aged 12 | Daplyn Trophy |
| 50m breaststroke | Jake Robinson | 37.04 | 2007-07-14 | aged 12 | Bishops Stortford Open |
| 50m butterfly | Greg Lasenby | 31.72 | 1998-05-24 | aged 12 | unknown fixture |
| 50m freestyle | James Sutherland | 28.24 | 2004-09-26 | aged 12 | Harlow Open |
| 100m backstroke | Jake Robinson | 1:13.58 | 2007-05-26 | aged 12 | Stevenage Open |
| 100m breaststroke | Jake Robinson | 1:22.33 | 2007-06-24 | aged 12 | Killerwhales Summer Invitation |
| 100m butterfly | Jake Robinson | 1:13.47 | 2007-06-24 | aged 12 | Killerwhales Summer Invitation |
| 100m freestyle | James Cook | 1:02.36 | 2012-01-21 | aged 12 | Biggleswade Open Day 1 |
| 100m individual medley | Jake Robinson | 1:10.68 | 2007-07-14 | aged 12 | Bishops Stortford Open |
| 200m backstroke | Jake Robinson | 2:38.18 | 2007-03-04 | aged 12 | Age Groups Day 2 |
| 200m breaststroke | Jake Robinson | 2:57.48 | 2007-03-03 | aged 12 | Age Groups Day 1 |
| 200m butterfly | Kieran Watkins | 2:49.02 | 2011-03-19 | aged 11 | Herts County Champs Day 4 |
| 200m freestyle | James Cook | 2:16.39 | 2012-01-22 | aged 12 | Biggleswade Open Day 2 |
| 200m individual medley | Jake Robinson | 2:36.93 | 2007-07-08 | aged 12 | Barnet Copthall Summer Sprints |
| 400m freestyle | Jake Robinson | 4:55.95 | 2007-03-10 | aged 12 | Age Groups Day 3 |
| 400m individual medley | Kieran Watkins | 5:50.62 | 2012-01-21 | aged 12 | Biggleswade Open Day 1 |
| 800m freestyle | Danny Buckley | 10:40.67 | 2007-03-11 | aged 12 | Age Groups Day 4 |
| 800m individual medley | Kieran Watkins | 6:04.45 | 2011-03-05 | aged 11 | Herts County Champs Day 2 |
| 1500m freestyle | Danny Buckley | 20:22.43 | 2007-03-04 | aged 12 | Age Groups Day 2 |
| 50m backstroke | Kirsty Hamshere | 33.32 | 2011-05-07 | aged 13 | Stevenage Open Day 1 |
| 50m breaststroke | Christie Bays | 36.61 | 2011-01-23 | aged 14 | Biggleswade Open Day 2 |
| 50m butterfly | Christie Bays | 32.25 | 2010-11-28 | aged 14 | Watford Open |
| 50m freestyle | Tina Bingham | 29.50 | 1997-10-27 | aged 14 | unknown fixture |
| 100m backstroke | Sandra Bennett | 1:09.40 | 1978-01-01 | aged 14 | unknown fixture |
| 100m breaststroke | Christie Bays | 1:18.09 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 100m butterfly | Christie Bays | 1:10.54 | 2011-01-23 | aged 14 | Biggleswade Open Day 2 |
| 100m freestyle | Sandra Bennett | 1:00.50 | 1978-01-01 | aged 14 | unknown fixture |
| 100m individual medley | Christie Bays | 1:12.16 | 2010-10-03 | aged 13 | Cheshunt Open |
| 200m backstroke | Sandra Bennett | 2:30.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m breaststroke | Christie Bays | 2:46.60 | 2011-01-23 | aged 14 | Biggleswade Open Day 2 |
| 200m butterfly | Claire Taylor | 3:12.91 | 1998-12-13 | aged 12 | Club 200 meet |
| 200m freestyle | Sandra Bennett | 2:10.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m individual medley | Christie Bays | 2:31.33 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 400m freestyle | Claire Shannon | 5:04.16 | 2001-03-10 | aged 14 | Age groups 2 & 3 |
| 400m individual medley | Abigail Lence | 6:11.35 | 2011-07-10 | aged 13 | Watford Open |
| 800m freestyle | Emma Eagland | 10:37.40 | 2011-03-04 | aged 14 | Herts County Champs Day 1 |
| 50m backstroke | Philip Aldwinckle | 31.10 | 2003-03-15 | aged 14 | Age Groups Day 3 |
| 50m breaststroke | Ian Shannon | 34.25 | 2001-11-25 | aged 14 | Hitchin Open |
| 50m butterfly | Greg Lasenby | 29.08 | 2000-05-28 | aged 14 | Bognor Regis Open |
| 50m freestyle | Edward Burrell | 26.29 | 2003-10-19 | aged 14 | Stevenage sprint meet |
| 100m backstroke | Philip Aldwinckle | 1:07.65 | 2003-03-30 | aged 14 | Age Groups Day 6 |
| 100m breaststroke | Ian Shannon | 1:14.42 | 2002-03-09 | aged 14 | Age Groups 4 |
| 100m butterfly | Greg Lasenby | 1:07.20 | 2000-04-15 | aged 14 | Herts Age Groups session 8 |
| 100m freestyle | Edward Burrell | 57.90 | 2003-10-11 | aged 14 | Speedo League 1 |
| 100m individual medley | Jake Robinson | 1:07.40 | 2009-03-14 | aged 14 | Herts County Champs Day 3 |
| 200m backstroke | Danny Buckley | 2:24.13 | 2009-04-12 | aged 14 | Watford Easter Open Day 2 |
| 200m breaststroke | Jake Robinson | 2:42.35 | 2009-05-10 | aged 14 | Stevenage Open |
| 200m butterfly | Jake Robinson | 2:37.98 | 2009-04-11 | aged 14 | Watford Easter Open Day 1 |
| 200m freestyle | Jake Robinson | 2:07.89 | 2009-03-21 | aged 14 | Herts County Champs Day 5 |
| 200m individual medley | Jake Robinson | 2:24.26 | 2009-03-21 | aged 14 | Herts County Champs Day 5 |
| 400m freestyle | Danny Buckley | 4:36.89 | 2009-04-12 | aged 14 | Watford Easter Open Day 2 |
| 400m individual medley | Jake Robinson | 5:14.78 | 2009-04-11 | aged 14 | Watford Easter Open Day 1 |
| 800m freestyle | Danny Buckley | 10:00.40 | 2009-01-09 | aged 14 | Icebreaker Meet 2009 Canterbury |
| 800m individual medley | Kieran Watkins | 6:04.45 | 2011-03-05 | aged 11 | Herts County Champs Day 2 |
| 1500m freestyle | Mark Aldwinckle | 18:14.03 | 2000-04-01 | aged 14 | Herts Age Groups session 6 |
| 50m backstroke | Leanne Akers | 32.98 | 2000-03-25 | aged 15 | Herts Age Groups sessions 4 & 5 |
| 50m breaststroke | Lucy Crocker | 36.04 | 2011-01-16 | aged 16 | Watford County Qualifier Day 2 |
| 50m butterfly | Christie Bays | 32.25 | 2010-11-28 | aged 14 | Watford Open |
| 50m freestyle | Tina Bingham | 28.50 | 2000-04-08 | aged 16 | Herts Age Groups session 7 |
| 100m backstroke | Sandra Bennett | 1:09.40 | 1978-01-01 | aged 14 | unknown fixture |
| 100m breaststroke | Christie Bays | 1:18.09 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 100m butterfly | Zena Everett | 1:08.08 | 1979-01-01 | aged 15 | unknown fixture |
| 100m freestyle | Sandra Bennett | 1:00.50 | 1978-01-01 | aged 14 | unknown fixture |
| 100m individual medley | Christie Bays | 1:12.16 | 2010-10-03 | aged 13 | Cheshunt Open |
| 200m backstroke | Sandra Bennett | 2:30.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m breaststroke | Christie Bays | 2:46.60 | 2011-01-23 | aged 14 | Biggleswade Open Day 2 |
| 200m butterfly | Zena Everett | 2:23.70 | 1979-01-01 | aged 15 | unknown fixture |
| 200m freestyle | Sandra Bennett | 2:10.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m individual medley | Christie Bays | 2:31.33 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 400m freestyle | Zena Everett | 4:38.70 | 1979-01-01 | aged 15 | unknown fixture |
| 400m individual medley | Abigail Lence | 6:11.35 | 2011-07-10 | aged 13 | Watford Open |
| 800m freestyle | Zena Everett | 9:37.90 | 1980-01-01 | aged 16 | unknown fixture |
| 1500m freestyle | Zena Everett | 18:23.80 | 1980-01-01 | aged 16 | unknown fixture |
| 50m backstroke | Danny Buckley | 29.65 | 2011-03-20 | aged 16 | Herts County Champs Day 5 |
| 50m breaststroke | Anthony Vaughn | 32.51 | 1997-09-28 | aged 15 | unknown fixture |
| 50m butterfly | Greg Lasenby | 27.66 | 2001-05-26 | aged 15 | Waltham Forest Open |
| 50m freestyle | Greg Lasenby | 25.85 | 2002-04-21 | aged 16 | Kate Lack Trophy meet |
| 100m backstroke | Danny Buckley | 1:03.55 | 2010-09-25 | aged 16 | Bishops Stortford Open Day 1 |
| 100m breaststroke | Ian Shannon | 1:11.43 | 2003-03-29 | aged 15 | Age Groups Day 5 |
| 100m butterfly | Lewis Reeves | 1:02.20 | 1996-05-25 | aged 16 | unknown fixture |
| 100m freestyle | Tobie Van Zwieten | 56.47 | 2011-03-20 | aged 16 | Herts County Champs Day 5 |
| 100m individual medley | Greg Lasenby | 1:04.26 | 2001-06-02 | aged 15 | Colchester Open |
| 200m backstroke | Danny Buckley | 2:15.79 | 2011-04-17 | aged 16 | Luton Open Day 2 |
| 200m breaststroke | Ian Shannon | 2:40.12 | 2003-03-15 | aged 15 | Age Groups Day 3 |
| 200m butterfly | Matthew Costello | 2:32.46 | 2010-09-04 | aged 16 | Hoddesdon Open |
| 200m freestyle | Jake Robinson | 2:05.17 | 2010-03-20 | aged 15 | Herts County Champs Day 4 |
| 200m individual medley | Philip Aldwinckle | 2:20.40 | 2004-12-11 | aged 16 | Speedo League 3 |
| 400m freestyle | Danny Buckley | 4:28.33 | 2010-03-13 | aged 15 | Herts County Champs Day 3 |
| 400m individual medley | Jake Robinson | 5:14.78 | 2009-04-11 | aged 14 | Watford Easter Open Day 1 |
| 800m freestyle | Ross Gillon | 9:31.31 | 2007-03-11 | aged 16 | Age Groups Day 4 |
| 800m individual medley | Matthew Costello | 5:32.75 | 2011-03-05 | aged 16 | Herts County Champs Day 2 |
| 1500m freestyle | Mark Aldwinckle | 18:07.53 | 2001-03-09 | aged 15 | Age Groups 1 |
| 50m backstroke | Claire Taylor | 32.39 | 2005-11-12 | aged 19 | Speedo League 2 |
| 50m breaststroke | Lucy Crocker | 36.04 | 2011-01-16 | aged 16 | Watford County Qualifier Day 2 |
| 50m butterfly | Claire Taylor | 30.54 | 2004-03-28 | aged 17 | Age Groups 10 |
| 50m freestyle | Claire Taylor | 28.09 | 2004-12-11 | aged 18 | Speedo League 3 |
| 100m backstroke | Claire Taylor | 1:08.91 | 2005-04-16 | aged 18 | Herts Major League 3 |
| 100m breaststroke | Christie Bays | 1:18.09 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 100m butterfly | Zena Everett | 1:08.08 | 1979-01-01 | aged 15 | unknown fixture |
| 100m freestyle | Sandra Bennett | 1:00.50 | 1978-01-01 | aged 14 | unknown fixture |
| 100m individual medley | Christie Bays | 1:12.16 | 2010-10-03 | aged 13 | Cheshunt Open |
| 200m backstroke | Sandra Bennett | 2:30.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m breaststroke | Christie Bays | 2:46.60 | 2011-01-23 | aged 14 | Biggleswade Open Day 2 |
| 200m butterfly | Zena Everett | 2:23.70 | 1979-01-01 | aged 15 | unknown fixture |
| 200m freestyle | Sandra Bennett | 2:10.50 | 1978-01-01 | aged 14 | unknown fixture |
| 200m individual medley | Christie Bays | 2:31.33 | 2011-01-22 | aged 14 | Biggleswade Open Day 1 |
| 400m freestyle | Zena Everett | 4:38.70 | 1979-01-01 | aged 15 | unknown fixture |
| 400m individual medley | Davina Garrod | 5:27.51 | 1989-01-01 | aged 18 | unknown fixture |
| 800m freestyle | Zena Everett | 9:37.90 | 1980-01-01 | aged 16 | unknown fixture |
| 1500m freestyle | Zena Everett | 18:23.80 | 1980-01-01 | aged 16 | unknown fixture |
| 50m backstroke | Danny Buckley | 29.65 | 2011-03-20 | aged 16 | Herts County Champs Day 5 |
| 50m breaststroke | Anthony Vaughn | 32.51 | 1997-09-28 | aged 15 | unknown fixture |
| 50m butterfly | Greg Lasenby | 27.03 | 2004-03-06 | aged 18 | Age Groups 4 |
| 50m freestyle | Greg Lasenby | 25.34 | 2008-05-25 | aged 22 | Stevenage Open Day 2 |
| 100m backstroke | Danny Buckley | 1:02.88 | 2012-01-22 | aged 17 | Biggleswade Open Day 2 |
| 100m breaststroke | Ian Shannon | 1:11.43 | 2003-03-29 | aged 15 | Age Groups Day 5 |
| 100m butterfly | Greg Lasenby | 1:00.90 | 2004-04-24 | aged 18 | Herts Major League 3 |
| 100m freestyle | Greg Lasenby | 56.06 | 2004-03-28 | aged 18 | Age Groups 10 |
| 100m individual medley | Greg Lasenby | 1:03.58 | 2002-09-28 | aged 17 | Harlow Open |
| 200m backstroke | Danny Buckley | 2:15.29 | 2012-01-21 | aged 17 | Biggleswade Open Day 1 |
| 200m breaststroke | Ian Shannon | 2:40.12 | 2003-03-15 | aged 15 | Age Groups Day 3 |
| 200m butterfly | Stephen Groves | 2:21.60 | 1972-10-01 | aged 17 | unknown fixture |
| 200m freestyle | Danny Buckley | 2:03.16 | 2012-01-22 | aged 17 | Biggleswade Open Day 2 |
| 200m individual medley | Philip Aldwinckle | 2:19.41 | 2005-12-10 | aged 17 | Speedo League 3 |
| 400m freestyle | Ross Gillon | 4:27.48 | 2008-03-15 | aged 17 | County Champs Day 5 |
| 400m individual medley | Mark Aldwinckle | 4:58.89 | 2004-03-06 | aged 18 | Age Groups 4 |
| 800m freestyle | Ross Gillon | 9:21.84 | 2008-03-01 | aged 17 | County Champs Day 1 |
| 800m individual medley | Matthew Costello | 5:32.75 | 2011-03-05 | aged 16 | Herts County Champs Day 2 |
| 1500m freestyle | Mark Aldwinckle | 17:44.62 | 2003-03-07 | aged 17 | Age Groups Day 1 |