The Best Pool & Spa Services in South Portland, ME
We graded 7 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 4,639 Google reviews of 35 top-rated pool & spa services nationwide; 7 of them in South Portland, ME. Updated October 28, 2026.
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Best pool & spa services in South Portland for swimming pool water analysis
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The Pool ShedHow Job match is calculatedBuilt only from reviews Google tagged “Swimming pool water analysis”:Stars on this job 55%4.96★Number of such jobs 25%24Overall Experts Score 20%76Job match= 89Stars are pulled toward the category average (4.81★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.89Job match = this company’s ★ on reviews Google tagged “Swimming pool water analysis” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.
What customers said about swimming pool water analysis
The Pool ShedEasy water test, kind expert who showed me what additives I needed, and I was out the door. Kind old shop dog was a lovely greeter.
The Pool ShedPool Shed is simply the best pool service company in southern maine! Great team!!
The Pool ShedI have been using this store since I moved to Hollis. They are always super nice, knowledgeable in what chemicals and testing. Highly recommend?!
The Pool ShedAdam Mowry and the entire team were extremely professional, communicative and very polite. Not once did we have and issue. We encountered ledge upon digging and Adam was upfront about everything and gave us a choice of continuing the inground pool or do above ground. They did a fantastic job and there was no…
The Pool ShedWe have been working with the guys at the Pool Shed for years now. They are always extraordinarily helpful, willing to answer all of my questions (even the ones they hear over and over again!), quick to respond to service issues, well-stocked with the best pool supplies, and a model of a professional,…
The Pool ShedWe are very satisfied with the annual services of opening and closing our pool. Great service. Will always go to them for service.
Overall ratings
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of pool & spa services).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Reliability (24%): How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Craft & service (0%): Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Replies to reviews (7%): How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  Merit Pools of Portland IncSouth Portland, ME | A 86How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%87+60.2Reliability 31%85+26.2Experts Score= 86Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–––– | 4.86 | — |
| 2 | The Pool ShedSouth Portland, ME | B 76How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%83+45.3Reliability 24%73+17.7Value 14%97+13.7Replies to reviews 7%11+0.8Craft & service penalty82−1.8Experts Score= 76Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAF | 4.80 | — |
| 3 |  Namco PoolsSouth Portland, ME | B 75How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%80+50.8Reliability 28%70+19.8Replies to reviews 8%57+4.7Experts Score= 75Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––AC | 4.48 | — |
| 4 |  Municipal PoolSouth Portland, ME | B 69How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%67+42.6Reliability 28%89+25.1Replies to reviews 8%13+1.1Experts Score= 69Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BA––AF | 4.61 | — |
| 5 |  Christman Pool ServiceSouth Portland, ME | B 68How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%68+43.2Reliability 28%76+21.5Replies to reviews 8%100+8.2Craft & service penalty50−5Experts Score= 68Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BBC–AA | 4.51 | — |
| 6 |  Astraea Wellness SpaSouth Portland, ME | B 65How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%74+40.4Reliability 24%66+16Value 14%52+7.4Replies to reviews 7%41+2.9Momentum penalty88−1.2Experts Score= 65Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BB–CAC | 4.77 | — |
| 7 |  Dave's Pool Sales & Service, Inc.South Portland, ME | C 44How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%52+33Reliability 28%26+7.3Replies to reviews 8%41+3.4Experts Score= 44Not enough data for value; its weight is shared by the others.Grade C: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | CD––AC | 4.46 | — |
What jobs cost
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
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Pool & Spa Services in South Portland, ME at a glance
How the 7 pool & spa services we rated in South Portland, ME compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A114%
- Grade B571%
- Grade C114%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up00%
- 4.80–4.89★229%
- 4.60–4.79★229%
- Below 4.60★343%
What customers praise
Share of Google review highlights.
- Quality15222%
- Professionalism17526%
- Responsiveness14622%
- Punctuality9814%
- Value10816%
Was the price fair?
All price verdicts left with reviews.
- Great price21131%
- Reasonable43764%
- Overpriced183%
- Not sure122%
Price verdicts by year
Share calling it great / reasonable / overpriced.
How we grade
Satisfaction (54%) — Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.
Reliability (24%) — How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.
Craft & service (penalty, up to −10) — Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.
Replies to reviews (7%) — How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.