Chiclana : any problems with septic tank or wells drying up?

Myself and my husband are considering buying a property in Chiclana de frontera, but are concerned that the houses we are able to afford do not have mains water or proper sanitisation.
Are there any british expats living in this area and do they have a property like this, do they have any problems with the septic tank or problems with the wells drying up. I would be grateful if someone could let me know.

Regards Sheila

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