From my experience of having water connected to our casa de campo in Murcia you will first of all need your LFO and a boletin from a plumber.Cost of boletin approx 100 euros.
Then the running around starts.
Take boletin to local mines and environment office. In our case this was in the Hacienda Office in Cartagena. GIven form to take to bank and pay the fee (about 8 euros) and bring back form to office. Form stamped and instructed to take to Town Hall.
Visit Town Hall - Urbanismo office. Given form to complete. Took form home and returned to Town Hall. Given another form to take to bank to pay fee (about 20 euros). Back to Town Hall and told they would be in touch.
Not heard anything from Town Hall so call in to enquire. " We sent you a letter. Did it not arrive? Thought it best not to answer, might upset them! Obtained copy of letter and told to take to Aguagest office.
Aguagest took form. Hooray, no bank visit required! Told to ring in a week and they would give us a quote after they had checked the site. "Which is your house? Is it the one with the pool cover?" It was. No problem.
Rang about three times and eventually got quote of 1500 euros for piping from mains, meter and connection. Told to go to office and pay.
Paid up at Aguagest office and everything fitted within 3 days.
Success!!! Was really proud that I had succeeded in my brush with Spanish system.