The table below lists the owners of evaporative cooling towers located in North Hertfordshire.
| Premises number | Location | Number of units |
|---|---|---|
| PR/709086 | Johnson Matthey plc, Orchard Road, Royston, SG8 5HJ |
6 |
| PR/713028 | Tesco Stores Ltd, Starwood House, Avenue One, Letchworth Garden City, SG6 2HB |
2 |
| PR/710907 | Ransom Naturals Ltd, 53 Burymead Road, Hitchin, SG5 1RT |
1 |
| PR/708182 | Professional Dry Cleaners, 25 Eastcheap, Letchworth Garden City, SG6 3DA |
1 |
| PR/714354 | Hottinger Bruel & Kjaer UK Ltd, Jarman Way, Royston, SG8 5BQ |
2 |
PR/711443 |
Hauck Heat Treatment Ltd, Blackhorse Road, Letchworth Garden City, SG6 1HD |
3 |