60/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 125 Google reviews.
Best Septic Service Companies in Grass Valley, CA (2026)
13 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Grass Valley: Mr. Rooter Plumbing of Nevada County, CR Score 60/100; 4.9★ from 125 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Craig Johnson Plumbing & Rooter Service, posts 24/7 hours; ranked #2 of 13.
- 4
Most-reviewed: Navo & Sons Inc, 207 Google reviews at 4.9★, the most of 13 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
13 Grass Valley septic service companies are ranked here by CR Score, from ten published factors. 3 are open 24/7, 6 open Saturdays and 5 open Sundays, based on posted hours. The median Google rating is 4.8★ across 13 rated businesses.
Top 10 septic service companies in Grass Valley at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mr. Rooter Plumbing of Nevada County | 60 | 4.9★ (125) | Grass Valley | 24/7 | Overall |
| 2 | Craig Johnson Plumbing & Rooter Service | 58 | 4.8★ (63) | Grass Valley | 24/7 | Emergencies |
| 3 | Anderson's Septic Inc. | 57 | 4.7★ (27) | Grass Valley | — | — |
| 4 | Navo & Sons Inc | 57 | 4.9★ (207) | Grass Valley | — | Most reviews |
| 5 | Urke Septic Services | 56 | 4.3★ (21) | Grass Valley | — | — |
| 6 | RS Clark Gold Country Septic | 55 | 4.8★ (6) | Grass Valley | 24/7 | — |
| 7 | J&C Engineering Inc | 55 | 5.0★ (9) | Grass Valley | — | — |
| 8 | Reliable Septic | 53 | 4.3★ (11) | Auburn, 22 mi away | Sat · Sun · Evenings | — |
| 9 | Quick Response Septic Services | 52 | 2.6★ (27) | Grass Valley | Sat · Sun | — |
| 10 | Sierra Septic Service & Supply | 51 | 4.8★ (22) | Rocklin, 24 mi away | — | — |
The 13 best septic service companies in Grass Valley, 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.
Based in Grass Valley
58/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 63 Google reviews.
Based in Grass Valley
57/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.7★ from 27 Google reviews, listed on Google as “Septic system service”.
Based in Grass Valley
57/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 207 Google reviews, the most in Grass Valley.
Based in Grass Valley
56/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.3★ from 21 Google reviews, listed on Google as “Septic system service”.
Based in Grass Valley
55/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.8★ from 6 Google reviews, listed on Google as “Plumber”.
Based in Grass Valley
55/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Septic system service”.
Based in Auburn, 22 mi away
53/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.3★ from 11 Google reviews, listed on Google as “Septic system service”.
Based in Grass Valley
52/100CR ScoreRanked #9 because of its Google rating and trade focus: 2.6★ from 27 Google reviews, listed on Google as “Plumber”.
Based in Rocklin, 24 mi away
51/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 22 Google reviews, listed on Google as “Septic system service”.
#11 The Rooter Guys
Based in Auburn, 21 mi away
51/100CR ScoreRanked #11 because of its Google rating and review volume: 4.9★ from 69 Google reviews.
Based in Auburn, 23 mi away
47/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Septic system service”.
Based in Lincoln, 21 mi away
46/100CR ScoreRanked #13 because of its Google rating and trade focus: 3.9★ from 21 Google reviews, listed on Google as “Contractor”.
Also serving Grass Valley
6 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 |
|---|---|---|
| All-Sierra Septic | In Grass Valley | |
| Chalpin Environmental Services Inc | In Grass Valley | |
| D Goodman Plumb Co | 5.0★ (1) | 25 mi |
| Lazy Drains Septic, Sewer and Drain Cleaning | 5.0★ (1) | In Grass Valley |
| Royal Septic Services | 22 mi | |
| Scout Underground Locating | 22 mi |
How we ranked Grass Valley septic service companies
We scored 13 Grass Valley 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 Grass Valley 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 Grass Valley: frequently asked questions
Who is the best septic service company in Grass Valley?
By CR Score, the highest-ranked septic service company in Grass Valley, CA is Mr. Rooter Plumbing of Nevada County with a CR Score of 60/100. It has 4.9★ from 125 Google reviews. It is open 24/7. Craig Johnson Plumbing & Rooter Service (#2) and Anderson's Septic Inc. (#3) follow. We ranked 13 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Grass Valley?
ContractorsRanked ranks 13 septic service companies serving Grass Valley, CA. 8 of them are based in Grass Valley; the rest serve it from nearby towns. Another 6 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Grass Valley are open 24/7?
3 ranked septic service companies in Grass Valley post 24/7 hours. The highest-ranked are Mr. Rooter Plumbing of Nevada County (#1), Craig Johnson Plumbing & Rooter Service (#2) and RS Clark Gold Country Septic (#6). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Grass Valley work on weekends?
6 of 13 ranked septic service companies post Saturday hours and 5 post Sunday hours. The highest-ranked open Saturdays are Mr. Rooter Plumbing of Nevada County (#1), Craig Johnson Plumbing & Rooter Service (#2) and RS Clark Gold Country Septic (#6). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Grass Valley septic service companies have?
The median Google rating among 13 rated septic service companies in Grass Valley is 4.8★, with a median of 22 reviews. Navo & Sons Inc has the most, 207 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 Grass Valley count in this ranking?
Yes, if they are within 25 mi of the Grass Valley 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 Grass Valley
- November 2026: CR Scores recalculated for 13 septic service companies serving Grass Valley.
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