Rajiv Yajnik5 reviewsTotal number of Google reviews Rajiv has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleExcellent sales and service
Dierolf Plumbing and Water Treatment, LLC
How 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%98+62.3Reliability 28%99+28Replies to reviews 8%100+8.2Experts Score= 98Not 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.98SCORE
AGradeLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#3 of 35 well inspectorsPosition by Experts Score among all companies we track in this category. · better than 94%
5.0 ★★★★★ 193 Google reviews · 8 photos
98%five-star reviews
4.99★last 12 monthsAverage stars on reviews from the last 12 months only.
0%1–2★ in 2 yearsShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
90%reviews answered by the owner
Oct 2026latest review
Dierolf Plumbing and Water Treatment, LLC at a glance
Customers describe Dierolf Plumbing and Water Treatment as punctual, professional, and thorough in services ranging from water testing to softener installation. Technicians frequently receive praise for explaining systems in detail, maintaining clean work areas, and providing helpful advice on water quality. One reviewer noted a discrepancy between the promised pre-work estimate and the final hourly rate, which caused unexpected costs despite the quick completion of the task.
- Google rating: 5.0 out of 5 from 193 reviews (98% five-star).
- Reviews on this page: 193 Google reviews (156 with written comments, 1 with photos).
- Owner responses: the business replied to 90% of reviews.
- Most recent review: October 16, 2026.
- Service: Well Inspector serving Philadelphia, Pennsylvania.
Data from Google, last updated October 25, 2026.
Score profile vs other well inspectors
Score per factor (100 = best)Each 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 replies to reviews; weakest: satisfaction.
SatisfactionSatisfaction · 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: 98/100 on this factor. Category median: 90.A
98
ReliabilityReliability · 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: 99/100 on this factor. Category median: 88.A
99
Craft & serviceCraft & 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: 97.–
–
ValueValue · 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.–
–
MomentumMomentum · 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 reviewsReplies 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: 100/100 on this factor. Category median: 82.A
100
Bar = this company · dark tick = category median.
Star ratings
193 Google reviews we collected
- 5 stars19098%
- 4 stars21%
- 3 stars11%
- 2 stars00%
- 1 star00%
Praise vs complaints
Phrases our text analysis found in 156 written reviews
- Praise324100%
- Complaints10%
Topic share
How often each topic comes up in the written reviews
- Staff & attitude10532%
- Quality & results6319%
- Speed & response5818%
- Communication4915%
- Would recommend3511%
- Price & value82%
- Honesty & trust72%
What customers talk about
We read 156 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Excellent and timely service and extremely knowledgeable.”
“I commend the company for providing exceptional service and remaining involved even after the system installation.”
“He was very polite and efficient and explained how the system works in detail to us.”
“Your Technican David Gomolka explained everything in great detail, and made it easy to understand what was going on.”
“I recommend Dierolf for all your clean water needs!”
“They got everything done quickly, did it expertly, and for a fair price.”
“Recommend for skilled, professional and reliable service.”
People customers mention
- David 7 reviews
- Jon 7 reviews
- Sam 4 reviews
- Bryan 4 reviews
- Justin 3 reviews
- Ethan 3 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Recent reviews
SimaLocal Guide · 43 reviewsTotal 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 3 weeks ago★★★★★
I commend the company for providing exceptional service and remaining involved even after the system installation. I am particularly impressed with the way Steve Feigan works. He is very knowledgeable and professional.
Robert11 reviewsTotal 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 month ago★★★★★
Jeff Linden was great... he went above and beyond to determine why a toilet was leaking below the floor, corrected the issue, and then properly reinstalled the toilet, which was done incorrectly.
Patrick3 reviewsTotal 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 month ago★★★★★
Dierolf Plumbing and Water Treatment did an excellent job troubleshooting pointing out defective components. Your Technican David Gomolka explained everything in great detail, and made it easy to understand what was going on. We had two companies in the past here and nobody's done as good a job as David did!…
DrLocal Guide · 101 reviewsTotal 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. · 2 months ago★★★★★
Excellent and timely service and extremely knowledgeable. Top notch. Highly recommended
Linda5 reviewsTotal 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. · 2 months ago★★★★★
On time, very respectful, and informational. I have used Dierolf many times for water and well inspections, water analysis, and flow tests. I highly recommend Dierolf!
TimLocal Guide · 21 reviewsTotal 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. · 3 months ago★★★★★
Colin explained everything perfectly and made suggestions for my water treatment system. I would definitely use them for additional work in the future.
Photos
Customer reviews
5.0 ★★★★★ 193 reviews on Google · rating breakdown
Reviews from Google, shown as published (original wording, unedited).
Jobs customers hired them for — from Google's service tags and the review text
Team members customers mention
Sima ZlockLocal Guide · 43 reviewsTotal number of Google reviews Sima has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleI commend the company for providing exceptional service and remaining involved even after the system installation. I am particularly impressed with the way Steve Feigan works. He is very knowledgeable and professional.
Robert Jacob11 reviewsTotal number of Google reviews Robert has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleJeff Linden was great... he went above and beyond to determine why a toilet was leaking below the floor, corrected the issue, and then properly reinstalled the toilet, which was done incorrectly.
Richard Rose10 reviewsTotal number of Google reviews Richard has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleDavid our tech was great. We will be using them for additional work.
Jennifer S7 reviewsTotal number of Google reviews Jennifer has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleColin did a fantastic job changing out out disposal!
Patrick Murphy3 reviewsTotal number of Google reviews Patrick has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleDierolf Plumbing and Water Treatment did an excellent job troubleshooting pointing out defective components. Your Technican David Gomolka explained everything in great detail, and made it easy to understand what was going on. We had two companies in the past here and nobody's done as good a job as David did! Appreciate it, and would suggest your company to others...
Dr CarchediLocal Guide · 101 reviewsTotal number of Google reviews Dr has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleExcellent and timely service and extremely knowledgeable. Top notch. Highly recommended
Joseph Francht11 reviewsTotal number of Google reviews Joseph has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleOn time. Great guys. A pleasure!
Linda Danese5 reviewsTotal number of Google reviews Linda has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleOn time, very respectful, and informational. I have used Dierolf many times for water and well inspections, water analysis, and flow tests. I highly recommend Dierolf!
Tim BeckLocal Guide · 21 reviewsTotal number of Google reviews Tim has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleColin explained everything perfectly and made suggestions for my water treatment system. I would definitely use them for additional work in the future.
Business details
- Address: 13 Village Square Suite 3, New Hope, PA 18938
- Phone: (267) 223-7211
- Website: dscwater.com
- Service area: Philadelphia, PA