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Best Septic Service Companies in Ottawa, IL (2026)

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

The short answer

  1. 1

    Best overall in Ottawa: Thrush Sanitation Service Inc, CR Score 59/100; 4.7★ from 60 Google reviews.

  2. 3

    Best for emergencies (open 24/7): Sewer 911 LLC, posts 24/7 hours; ranked #3 of 10.

  3. 2

    Most-reviewed: Zeiter's Septics Inc. Tank Cleaning & Septic Systems, 204 Google reviews at 5.0★, the most of 10 ranked; ranked #2.

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

10 Ottawa septic service companies are ranked here by CR Score, from ten published factors. 3 are open 24/7, 4 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 10 rated businesses.

Top 10 septic service companies in Ottawa at a glance

Top 10 septic service companies in Ottawa at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Thrush Sanitation Service Inc594.7★ (60)Ottawa—Overall
2Zeiter's Septics Inc. Tank Cleaning & Septic Systems585.0★ (204)Morris, 22 mi away—Most reviews
3Sewer 911 LLC565.0★ (16)Peru, 7 mi away24/7Emergencies
4Mr. Rooter Plumbing of Ottawa-La Salle544.4★ (106)Peru, 14 mi away24/7—
5Premier Sewer & Septic Service534.9★ (201)Sandwich, 25 mi away——
6Papa's Septic Pumping & Services533.6★ (15)Streator, 16 mi away——
7Roto-Rooter Sewer & Drain Cleaning Service525.0★ (11)Peru, 20 mi away24/7—
8USA 1 Excavating515.0★ (7)Mendota, 21 mi awaySat—
9E L Wilkinson Plumbing Sewer504.8★ (20)Streator, 14 mi away——
10Joe Hatzer & Son Contractors Inc454.0★ (14)Streator, 16 mi away——

The 10 best septic service companies in Ottawa, ranked

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

  1. Ranked #1 in Ottawa

    #1 Thrush Sanitation Service Inc

    Based in Ottawa

    59/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.7★ from 60 Google reviews, listed on Google as “Septic system service”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 60 Google reviews
    Hours
    Mon–Fri 7 AM–4:30 PM · Sat–Sun closed
    Address
    1000 Evans St, Ottawa, IL 61350
    View profile for Thrush Sanitation Service Inc(815) 434-5557

  2. #2 Zeiter's Septics Inc. Tank Cleaning & Septic Systems

    Based in Morris, 22 mi away

    58/100CR Score

    Ranked #2 because of its Google rating and review volume: 5.0★ from 204 Google reviews, the most in Ottawa.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 204 Google reviews
    Hours
    Mon–Thu 7 AM–4 PM · Fri 7 AM–3 PM · Sat–Sun closed
    Address
    2400 N. IL. Rt, 2400 IL-47, Morris, IL 60450
    View profile for Zeiter's Septics Inc. Tank Cleaning & Septic Systems(815) 942-2829

  3. #3 Sewer 911 LLC

    Based in Peru, 7 mi away

    56/100CR Score

    Ranked #3 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Plumber”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 16 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Sewer 911 LLC(833) 739-3791

  8. #8 USA 1 Excavating

    Based in Mendota, 21 mi away

    51/100CR Score

    Ranked #8 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.

    • 5.0★ from 7 Google reviews
    Hours
    Mon–Sat 7 AM–5 PM · Sun closed
    Address
    4450 E 250th Rd, Mendota, IL 61342
    View profile for USA 1 Excavating(815) 538-6035

  9. #9 E L Wilkinson Plumbing Sewer

    Based in Streator, 14 mi away

    50/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.8★ from 20 Google reviews, listed on Google as “Plumber”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.8★ from 20 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    1741 Baker St, Streator, IL 61364
    View profile for E L Wilkinson Plumbing Sewer(815) 672-8588

Also serving Ottawa

2 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.

Unranked septic service companies serving Ottawa
BusinessGoogle ratingDistance
B & E Sewer & Water Inc3.0★ (2)21 mi
BUK Mechanical24 mi

How we ranked Ottawa septic service companies

We scored 10 Ottawa 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 Ottawa 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 Ottawa: frequently asked questions

Who is the best septic service company in Ottawa?

By CR Score, the highest-ranked septic service company in Ottawa, IL is Thrush Sanitation Service Inc with a CR Score of 59/100. It has 4.7★ from 60 Google reviews. Zeiter's Septics Inc. Tank Cleaning & Septic Systems (#2) and Sewer 911 LLC (#3) follow. We ranked 10 septic service companies on ten factors, last updated November 3, 2026.

How many septic service companies are there in Ottawa?

ContractorsRanked ranks 10 septic service companies serving Ottawa, IL. 1 of them is based in Ottawa; the rest serve it from nearby towns. Another 2 within 25 mi are listed but not ranked yet. Counts are as of November 2026.

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

3 ranked septic service companies in Ottawa post 24/7 hours. The highest-ranked are Sewer 911 LLC (#3), Mr. Rooter Plumbing of Ottawa-La Salle (#4) and Roto-Rooter Sewer & Drain Cleaning Service (#7). Hours come from each business's Google listing as of November 2026, so call to confirm.

Which septic service companies in Ottawa work on weekends?

4 of 10 ranked septic service companies post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are Sewer 911 LLC (#3), Mr. Rooter Plumbing of Ottawa-La Salle (#4) and Roto-Rooter Sewer & Drain Cleaning Service (#7). Posted hours are office hours; crews may book weekend jobs separately.

What Google rating do Ottawa septic service companies have?

The median Google rating among 10 rated septic service companies in Ottawa is 4.8★, with a median of 18 reviews. Zeiter's Septics Inc. Tank Cleaning & Septic Systems has the most, 204 reviews, and ranks #2. 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 Ottawa count in this ranking?

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

  1. November 2026: CR Scores recalculated for 10 septic service companies serving Ottawa.

More septic service companies and Ottawa pages

Other trades in Ottawa