Water testing service · Philadelphia, PA · reviewed since 2013
iHow 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%97+61.6Reliability 28%97+27.4Replies to reviews 8%78+6.4Experts Score= 95Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.95SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#7 of 11 water softener servicesiPosition by Experts Score among all companies we track in this category. · better than 40%
5.0★★★★★1,323 Google reviews · 24 photos
99%five-star reviews
4.95★last 12 monthsiAverage stars on reviews from the last 12 months only.
0.6%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
Dierolf Plumbing and Water Treatment, LLC at a glance
Customers frequently praise the company for punctual arrivals, clear communication, and thorough explanations of water treatment options, repairs, and installations. The business handles services like sump pump replacements, well water testing, and softener installations, with reviewers noting professional conduct and fair pricing. While the owner responds to a significant portion of feedback, lower-rated reviews highlight concerns regarding unclear pricing structures and instances of property damage or defensive responses to service failures.
Google rating: 5.0 out of 5 from 1,323 reviews (99% five-star).
Reviews on this page: 1,323 Google reviews (977 with written comments, 18 with photos).
Owner responses: the business replied to 78% of reviews.
Most recent review: October 27, 2026.
Service: Water Softener Service serving Philadelphia, Pennsylvania.
Data from Google, last updated October 27, 2026.
Score profile vs other water softener services
Score per factor (100 = best)iEach factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: momentum and satisfaction; weakest: replies to reviews.
This companyWater Softener Services median0 = centre, 100 = best
SatisfactioniSatisfaction · 54% of the scoreRecency-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.Dierolf Plumbing and Water Treatment, LLC: 97/100 on this factor. Category median: 97.A
97
ReliabilityiReliability · 24% of the scoreHow 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.Dierolf Plumbing and Water Treatment, LLC: 97/100 on this factor. Category median: 97.A
97
Craft & serviceiCraft & service · penalty only, up to −10 pointsGoogle 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.Not enough reviews for this factor yet. Category median: 100.–
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ValueiValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Not enough reviews for this factor yet. Category median: 100.–
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MomentumiMomentum · penalty only, up to −10 pointsPenalises 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.Dierolf Plumbing and Water Treatment, LLC: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsiReplies to reviews · 7% of the scoreHow 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.Dierolf Plumbing and Water Treatment, LLC: 78/100 on this factor. Category median: 100.B
78
Bar = this company · dark tick = category median.
Star ratings
1,323 Google reviews we collected
5.0of 5
5 stars1,30999%
4 stars91%
3 stars10%
2 stars10%
1 star30%
Praise vs complaints
Phrases our text analysis found in 977 written reviews
99%praise
Praise2,07399%
Complaints111%
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude61530%
Quality & results39319%
Speed & response35517%
Communication29714%
Would recommend25212%
Price & value1075%
Honesty & trust653%
What customers talk about
We read 977 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Great customer service from your company and the tech Noah that came to our house was knowledgeable and courteous.”
“Matt was thoughtful, thorough, and explained everything.”
“…replacement but cautioned that the short-cycling might have already damaged the older pump motor.…”
“He finished quickly and even loaded in the salt that came with the annual check up.”
“The intent was to slowly modernize our home's out of date systems after moving in about a year ago, so we wanted an expert opinion on how to proceed w…”
“As he worked he explained how the system operated, what he was testing and why and what the parts looked like when fresh and when time for change…all…”
“I would highly recommend to anyone looking for plumbing services.”
“Lehigh Valley Water Systems was a breeze, I highly recommend their services instead if you're on the fence.”
“Originally identified issue by testing well water which was quickly mitigated with installation of additional equipment at a fair price.”
“Honest & Professional- and just really nice people!”
People customers mention
David21 reviews
Jon20 reviews
Justin20 reviews
Matt19 reviews
Mark17 reviews
Sam17 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Recent reviews
HeatherLocal Guide · 5 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 hours ago★★★★★
Jeff is an exceptional plumber. He made sure I understood the problem and all available solutions. He made it easy to trust him! Dierolf is lucky to have him!
Jennifer2 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · Edited 5 hours ago★★★★★
Great customer service from your company and the tech Noah that came to our house was knowledgeable and courteous.
Rajiv5 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 days ago★★★★★
Tammy was incredible. Excellent service and follow up.
The technicians were knowledgeable, efficient and absolutely incredible.
Grace7 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 5 days ago★★★★★
We used Dierolf for our home inspection. They were great to work with! No issues!
Dan2 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 6 days ago★★★★★
The original DC Battery Backup install did not function as expected. However, Dierolf Plumbing continued to work with me until the functional problem was resolved. Thanks to the Service Manager Steve and the Technician Colin.
Elizabeth2 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a week ago★★★★★
Jeff was knowledgeable and explained what needed to be done in a clear and respectful manner. 10/10 recommend this technician.
Jeff is an exceptional plumber. He made sure I understood the problem and all available solutions. He made it easy to trust him! Dierolf is lucky to have him!
Response from the owner · 2 hours ago
Thank you, Heather, for your wonderful review! We're thrilled to hear about your positive experience with Jeff at Dierolf Plumbing and Water Treatment.
Jennifer Carpani2 reviewsiTotal number of Google reviews Jennifer has written across all businesses on Google Maps, not just this one.
Great customer service from your company and the tech Noah that came to our house was knowledgeable and courteous.
Response from the owner · Edited 2 years ago
Jennifer, thanks for the review! We're so glad that we were able to meet your needs, and it's great that Bryan was courteous to you and your home! Remember to give us a call if you ever need us again. Our phone number is (484) 300-2800. You can also go on our website at www.DSCwater.com. And don't forget to check out our referral program, Dinner on Dierolf, so you can earn cool rewards! Looking forward to serving you again soon!
Chris Przemieniecki9 reviewsiTotal number of Google reviews Chris has written across all businesses on Google Maps, not just this one.
Matt was thoughtful, thorough, and explained everything. Excellent service.
Response from the owner · a day ago
Thank you so much for your kind words, Chris! We’re thrilled to hear you had an excellent experience with Matt at Dierolf Plumbing and Water Treatment.
Thomas Gerfen6 reviewsiTotal number of Google reviews Thomas has written across all businesses on Google Maps, not just this one.
Jeff L is a master. This summer he solved a tricky problem of replacing an old "pig iron" drainpipe encased in a beautiful Art Deco tile wall...without damaging the tile. His long practical experience and vast knowledge of pipes and fittings allowed him to find a creative solution that saved our tile wall. Thank you Jeff.
So, I was surprised when he showed up for our routine annual water system maintenance. He said "I have the time and they gave me your assignment". Not one to waste time, Jeff went straight to work. Once again, his practical experience gave us confidence that we were in good hands. He finished quickly and even loaded in the salt that came with the annual check up. Again; Jeff is a master. Thank You!
Sam S was prompt, personable and clearly knew his trade. For our annual maintenance I wanted to better know our well water softening system. As he worked he explained how the system operated, what he was testing and why and what the parts looked like when fresh and when time for change…all in plain English so I could understand.
For the added line we requested, he asked the right questions got straight to work and finished quickly.
Sam is young but don’t be fooled he knows his business.
Response from the owner · 11 months ago
Thomas, we love hearing how helpful Sam was during your UV service, water softener service, and hose bib install in Douglassville! It’s awesome that he took the time to walk you through everything. He’ll really appreciate this review! Remember to check out our referral program so you can earn rewards!
Rajiv Yajnik5 reviewsiTotal number of Google reviews Rajiv has written across all businesses on Google Maps, not just this one.
Tammy was incredible. Excellent service and follow up.
The technicians were knowledgeable, efficient and absolutely incredible.
Response from the owner · 4 days ago
Thank you so much for your kind words, Rajiv! We’re thrilled to hear that Tammy and our team provided you with excellent service at Dierolf Plumbing and Water Treatment.
Grace Arndt7 reviewsiTotal number of Google reviews Grace has written across all businesses on Google Maps, not just this one.
The original DC Battery Backup install did not function as expected. However, Dierolf Plumbing continued to work with me until the functional problem was resolved. Thanks to the Service Manager Steve and the Technician Colin.
Response from the owner · 5 days ago
Thank you, Dan! We're thrilled to hear that Steve and Colin were able to resolve the issue with your DC Battery Backup installation at Dierolf Plumbing.
Elizabeth Jones2 reviewsiTotal number of Google reviews Elizabeth has written across all businesses on Google Maps, not just this one.
Jeff was knowledgeable and explained what needed to be done in a clear and respectful manner. 10/10 recommend this technician.
Response from the owner · 6 days ago
Thank you so much, Elizabeth, for your wonderful review! We're thrilled to hear about your positive experience with Jeff at Dierolf Plumbing and Water Treatment.
simon kassas5 reviewsiTotal number of Google reviews simon has written across all businesses on Google Maps, not just this one.
As a new customer, we are so far very pleased with Dierolf Plumbing. Tammy was very friendly, knowledgable and was generous with incentives on her estimate for a new acid neutralizer and water softener. On the day of installation, Colin was on time, friendly and patiently answered all of our questions. He did a great job consolidating the pipes, drainage & electrical so it was more efficiently organized and neat.
Response from the owner · a week ago
Thank you so much for your wonderful review, Simon! We're thrilled to hear that you had a great experience with Tammy and Colin at Dierolf Plumbing.
John FitzGerald4 reviewsiTotal number of Google reviews John has written across all businesses on Google Maps, not just this one.
David at Dierolf arrived promptly for a consultation on my water systems (water heater, water softener and well system). He was very polite and professional. He listened to and answered my questions concisely. Tests were conducted on our water and I received two quote options promptly based on our discussion.
Response from the owner · a week ago
Thank you, John, for your wonderful review! We’re glad to hear about your positive experience with David and that he was able to assist you with your water systems at Dierolf Plumbing and Water Treatment.
