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Best Septic Service Companies in Onalaska, WI (2026)

6 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Onalaska: Si Pumping, CR Score 60/100; 5.0★ from 31 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Level Sewer and Drain, posts 24/7 hours; ranked #2 of 6.

  3. 4

    Most-reviewed: Maxwell-White Plumbing, 946 Google reviews at 4.9★, the most of 6 ranked; ranked #4.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

6 Onalaska septic service companies are ranked here by CR Score, from ten published factors. 3 are open 24/7, 3 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.9★ across 6 rated businesses.

Top 6 septic service companies in Onalaska at a glance

Top 6 septic service companies in Onalaska at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Si Pumping605.0★ (31)La Crosse, 10 mi away24/7Overall
2Level Sewer and Drain584.9★ (60)La Crosse, 4 mi away24/7Emergencies
3Advanced Plumbing Systems, LLC564.9★ (825)La Crosse, 3 mi away——
4Maxwell-White Plumbing554.9★ (946)West Salem, 9 mi away—Most reviews
5A-1 Advanced Pumping Services Inc544.8★ (18)West Salem, 7 mi away——
6Able Plumbing Pump & Well491.0★ (5)Holmen, 6 mi away24/7—

The 6 best septic service companies in Onalaska, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in Onalaska

    #1 Si Pumping

    Based in La Crosse, 10 mi away

    60/100CR Score

    Ranked #1 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Septic system service”.

    • 5.0★ from 31 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    W3077 Co Rd I, La Crosse, WI 54601
    View profile for Si Pumping(608) 386-4155

  4. #4 Maxwell-White Plumbing

    Based in West Salem, 9 mi away

    55/100CR Score

    Ranked #4 because of its Google rating and review volume: 4.9★ from 946 Google reviews, the most in Onalaska.

    • 4.9★ from 946 Google reviews
    Hours
    Mon–Thu 7:15 AM–4 PM · Fri 7:15 AM–3 PM · Sat–Sun closed
    Address
    W3032 County Rd B, West Salem, WI 54669
    View profile for Maxwell-White Plumbing(608) 200-2646

How we ranked Onalaska septic service companies

We scored 6 Onalaska 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Onalaska data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

Septic service companies in Onalaska: frequently asked questions

Who is the best septic service company in Onalaska?

By CR Score, the highest-ranked septic service company in Onalaska, WI is Si Pumping with a CR Score of 60/100. It has 5.0★ from 31 Google reviews. It is open 24/7. Level Sewer and Drain (#2) and Advanced Plumbing Systems, LLC (#3) follow. We ranked 6 septic service companies on ten factors, last updated November 3, 2026.

How many septic service companies are there in Onalaska?

ContractorsRanked ranks 6 septic service companies serving Onalaska, WI. Counts are as of November 2026.

Which septic service companies in Onalaska are open 24/7?

3 ranked septic service companies in Onalaska post 24/7 hours. The highest-ranked are Si Pumping (#1), Level Sewer and Drain (#2) and Able Plumbing Pump & Well (#6). Hours come from each business's Google listing as of November 2026, so call to confirm.

Which septic service companies in Onalaska work on weekends?

3 of 6 ranked septic service companies post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are Si Pumping (#1), Level Sewer and Drain (#2) and Able Plumbing Pump & Well (#6). Posted hours are office hours; crews may book weekend jobs separately.

What Google rating do Onalaska septic service companies have?

The median Google rating among 6 rated septic service companies in Onalaska is 4.9★, with a median of 46 reviews. Maxwell-White Plumbing has the most, 946 reviews, and ranks #4. 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 Onalaska count in this ranking?

Yes, if they are within 25 mi of the Onalaska 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 Onalaska

  1. November 2026: CR Scores recalculated for 6 septic service companies serving Onalaska.

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