59/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Best Septic Service Companies in Oconomowoc, WI (2026)
36 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Oconomowoc: Herr Septic & Sewer, CR Score 59/100; 4.9★ from 35 Google reviews.
- 3
Best for emergencies (open 24/7): C&C Pumps, posts 24/7 hours; ranked #3 of 36.
- 22
Most-reviewed: Rozga Plumbing Corp., 742 Google reviews at 4.8★, the most of 36 ranked; ranked #22.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
36 Oconomowoc septic service companies are ranked here by CR Score, from ten published factors. 7 are open 24/7, 9 open Saturdays and 7 open Sundays, based on posted hours. The median Google rating is 4.8★ across 36 rated businesses.
Top 10 septic service companies in Oconomowoc at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Herr Septic & Sewer | 59 | 4.9★ (35) | Oconomowoc | — | Overall |
| 2 | Aero-Stream LLC | 57 | 4.8★ (108) | Hartland, 9 mi away | — | — |
| 3 | C&C Pumps | 56 | 5.0★ (149) | Hartford, 11 mi away | 24/7 | Emergencies |
| 4 | Area Septic Installation | 56 | 4.9★ (27) | Oconomowoc | — | — |
| 5 | Mr. Rooter Plumbing of Southeast WI | 55 | 4.6★ (625) | Brookfield, 18 mi away | 24/7 | — |
| 6 | Rural Sanitation, Inc. | 55 | 4.9★ (153) | Slinger, 18 mi away | — | — |
| 7 | Leverenz Septic Service, L.L.C. | 55 | 5.0★ (16) | Oconomowoc | — | — |
| 8 | Herr Environmental Inc | 55 | 5.0★ (4) | Oconomowoc | — | — |
| 9 | Herr Construction Inc | 54 | 4.2★ (17) | Oconomowoc | — | — |
| 10 | MGA Sewer, Water & Gas Plumbing Contractor 24hr Emergency Services Available 7 Days A Week | 54 | 4.8★ (91) | Milwaukee, 24 mi away | 24/7 | — |
The 36 best septic service companies in Oconomowoc, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Hartland, 9 mi away
57/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.8★ from 108 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#3 C&C Pumps
Based in Hartford, 11 mi away
56/100CR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 149 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oconomowoc
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 27 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Brookfield, 18 mi away
55/100CR ScoreRanked #5 because of its Google rating and review volume: 4.6★ from 625 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Slinger, 18 mi away
55/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 153 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oconomowoc
55/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oconomowoc
55/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Oconomowoc
54/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.2★ from 17 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milwaukee, 24 mi away
54/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 91 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hartland, 8 mi away
53/100CR ScoreRanked #11 because of its Google rating and review volume: 4.8★ from 33 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Waukesha, 20 mi away
53/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.5★ from 57 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#13 Sewer Ninjas
Based in Brookfield, 22 mi away
52/100CR ScoreRanked #13 because of its Google rating and review volume: 5.0★ from 287 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Germantown, 21 mi away
52/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 62 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Slinger, 18 mi away
52/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 41 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Waukesha, 12 mi away
51/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 12 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Waukesha, 12 mi away
51/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 65 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Waukesha, 12 mi away
51/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 58 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milwaukee, 22 mi away
51/100CR ScoreRanked #19 because of its Google rating and trade focus: 2.1★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richfield, 17 mi away
51/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Watertown, 16 mi away
51/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.4★ from 19 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in West Allis, 23 mi away
50/100CR ScoreRanked #22 because of its Google rating and review volume: 4.8★ from 742 Google reviews, the most in Oconomowoc.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hartford, 21 mi away
50/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 8 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Waukesha, 14 mi away
50/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#25 Eckmayer Inc.
Based in Madison, 25 mi away
50/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.3★ from 92 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
All 36 septic service companies
#1 to #25 are shown in full above. Here are #26 to #36, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Dependable Sewer & Drain Cleaning | 50 | 4.5★ (74) | 21 mi |
| 27 | Septic tank pumping Ozaukee Washington Counties – Quality Removal | 49 | 4.7★ (13) | 20 mi |
| 28 | Lietzau Inc | 49 | 3.7★ (6) | 16 mi |
| 29 | Discount Drain & Sewer Cleaning | 48 | 4.0★ (8) | 24 mi |
| 30 | E&W Sewer & Water Construction, Inc. | 48 | 3.7★ (3) | 20 mi |
| 31 | Hubred Septic Pumping & Porta-Potties | 48 | 5.0★ (3) | 18 mi |
| 32 | Bull's-Eye Sewer & Drain | 48 | 4.6★ (22) | 23 mi |
| 33 | Fred's Sanitary Services | 47 | 4.2★ (82) | 9 mi |
| 34 | Visu-Sewer, LLC | 46 | 3.6★ (16) | 15 mi |
| 35 | Lindner Bros Sewer & Excavating, Inc. | 45 | 5.0★ (7) | 20 mi |
| 36 | Ulmer's Plumbing & Septic Services | 42 | 3.0★ (5) | 23 mi |
Also serving Oconomowoc
10 more septic service companies within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| AAA Quality Sewer & Drain | 2.0★ (1) | 24 mi |
| American Sewer Parts & Cleaning | 21 mi | |
| Badgerland Soil Testing Inc | 4.5★ (2) | 22 mi |
| Environment Specialist | 15 mi | |
| Hoefler Septic Service | 5.0★ (1) | 6 mi |
| Jaws Debris Catcher | 21 mi | |
| Milwaukee Septic System | 24 mi | |
| Roto Rooter Plumbing & Drain Service | 24 mi | |
| Sunset Septic Services | 5.0★ (1) | In Oconomowoc |
| Townsend Septic Inspections, LLC | 5.0★ (1) | 23 mi |
How we ranked Oconomowoc septic service companies
We scored 36 Oconomowoc septic service companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 3, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Oconomowoc data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
Septic service companies in Oconomowoc: frequently asked questions
Who is the best septic service company in Oconomowoc?
By CR Score, the highest-ranked septic service company in Oconomowoc, WI is Herr Septic & Sewer with a CR Score of 59/100. It has 4.9★ from 35 Google reviews. Aero-Stream LLC (#2) and C&C Pumps (#3) follow. We ranked 36 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Oconomowoc?
ContractorsRanked ranks 36 septic service companies serving Oconomowoc, WI. 5 of them are based in Oconomowoc; the rest serve it from nearby towns. Another 10 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Oconomowoc are open 24/7?
7 ranked septic service companies in Oconomowoc post 24/7 hours. The highest-ranked are C&C Pumps (#3), Mr. Rooter Plumbing of Southeast WI (#5) and MGA Sewer, Water & Gas Plumbing Contractor 24hr Emergency Services Available 7 Days A Week (#10). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Oconomowoc work on weekends?
9 of 36 ranked septic service companies post Saturday hours and 7 post Sunday hours. The highest-ranked open Saturdays are C&C Pumps (#3), Mr. Rooter Plumbing of Southeast WI (#5) and MGA Sewer, Water & Gas Plumbing Contractor 24hr Emergency Services Available 7 Days A Week (#10). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Oconomowoc septic service companies have?
The median Google rating among 36 rated septic service companies in Oconomowoc is 4.8★, with a median of 25 reviews. Rozga Plumbing Corp. has the most, 742 reviews, and ranks #22. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank septic service companies?
Each septic service company gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do septic service companies outside Oconomowoc count in this ranking?
Yes, if they are within 25 mi of the Oconomowoc city center, our service radius for septic service companies. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can septic service companies pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Oconomowoc
- November 2026: CR Scores recalculated for 36 septic service companies serving Oconomowoc.
More septic service companies and Oconomowoc pages
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