spring lines suitable for growing watercress
* Billerica Farm, near Upton Noble, Somerset: Although this farm might be named after the other Billericas, the site is also close to springs suitable for farming watercress.

The Tudor antiquarian John Leland believed the already-abandoned Billerica in Kent was a variant of Bellocastrum, 'fair castle' in Latin. In Billericay, there is a Roman fort at Blunt's Wall