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JL Pool Service LLC is a one-person Lowell operation run by John Lynch, who says he's been doing pool work since childhood — helping his father from age eight, working full time by fourteen — even though the LLC itself is only about a year old on Thumbtack. Every readable review calls out the same thing: he actually diagnoses the problem instead of doing the minimum. In a July 2026 review, a customer described him fixing what a prior company, Precision Pool, couldn't — beyond adjusting valves and a partial cleaning — at a price they called reasonable. Reviews from May and April 2026 describe him as thorough and patient with a first-time pool owner's questions, and 'gone above and beyond any prior pool company.' Two more from mid-to-late 2025 cover a fall winterization and an algae cleanup with extra chemical adjustments, both ending with the customer planning to rehire him. On Thumbtack he holds a 4.4★ average from 15 ratings and a background check on file, and says in his profile he's a certified pool and spa operator. Worth noting: about 13% of those 15 ratings are one-star, but no one-star review text is visible to explain what went wrong there — the five readable accounts are uniformly positive. He also lists general handyman work — TV mounting, furniture assembly, trim and closet installs — alongside the pool service, so it's worth confirming which side of the business fits a given job before booking.
Responded immediately; came 2 days later and resolved the problems Precision Pool did not. Listened to my concerns and resolved them, instead of just adjusting valves and partial cleaning. Also very reasonable. Thanks John. Details: In ground, Outdoors, Concrete, Non-functional pump. Swimming Pool Repair.
I hired John for the 1st time to open my above ground pool, He came when he said he would, very thorough and knowledgeable, He knew more about my pool than I did. He was very patient with all my questions because I am fairly new at this. I had all the parts to pool filter ready and in a short time had it up and running!! I will definitely call him when I need him and for sure...to close it in Fall. THANKS JOHN, Rosa B. (Lynn). Details: Winterization, Above ground pool, Vinyl, Chlorinated water, Pool water is clear, One time only.
10/10, he's so professional, kind and extremely knowledgeable. He has already gone above and beyond any prior pool company we have used before. So glad we found his company! Details: Cleaning and Maintenance, In-ground pool, Chlorinated water, Pool water is green or cloudy, Algae, Leaves, Insects, Once a week, Diving board or slide.
First time pool owner with no experience. John closed up the pool for me this year. Will be contacting again for opening. Appreciate the good work. Details: Winterization, Above ground pool, Vinyl, Chlorinated water, Pool water is clear, Leaves, One time only.
Very knowledgeable and performed the work plus some extra cleaning and chemical adjustments. Made suggestions for future projects and would definitely hire him again. Details: Cleaning and Maintenance, In-ground pool, Concrete, Chlorinated water, Pool water is green or cloudy, Algae, Every other week, Cleaning system.
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1 change recorded — last scanned Jul 30, 2026.
