As a kid there is was a lamppost we used to scale up to get into the watertower grounds, the only lamppost next to the wall up Pine Walks. we got caught a few times, and since they have added Vandal grease and spikes to stop people getting in.
I live near the Borehole and got talking to some of the lads from North West Water a few years ago. The water is now pumped from one of four grey covered shafts that you can see on the map:
Every six months or so a huge crane turns up to move the pipes from one shaft to another. The pipes I'd say are over 10m high when they are out the ground.
About 8 years ago very small traces of arsenic were found in the water which was why the treatment plant at the rear of the pump house was built.
A few years later United Utils seemed very interested in the sewers that run down Prenton Village Rd. I found a doc on the internet that highlighted a risk of cryptosporidium osmos in the prenton plant. I rang United Utils and spoke to someone quite high up almost straight away.
The danger was because the sewers were old and likely to seep into the drinking water at the borehole. Lanes for drains lined the sewers to prevent this happening. United utils informed me that they have monitoring equipment in the plant. The borehole pumps its water up to Prenton tank. Also you will see that an old shaft in the Dell flats car park next door is now fenced off (this was also mentioned in the doc I found). I assume this must still link with the underground water supply and they didnt want to risk contamination.
Of other interest it that Prenton Village carries 2 runs of cable into Birkenhead which form part of the 275KV link to Lister Drive in Liverpool. These were replaced a few years ago, but you can still see the old grey cast iron junction boxes in Prenton Dell and Waterpark Rd.