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William Conwell

DUI and DWI Attorney at Lakeport, CA

4.9   16 reviews
Free consultation
Free consultation
  • Licensed for 20 years
    State CA
    Acquired 2003
    Active No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About William

Learn William’s areas of practice.

Practice areas
  1. DUI and DWI
    I'm very experienced in driving under the influence cases both alcohol and drug dui's as well felony dui's that involve injuries or severe injuries.

    21 years

  2. Criminal defense
    I handle marijuana cases (cultivation, possession for sales, marijuana laboratory cases) as well as other illegal narcotics.

    21 years

  3. Domestic violence
    In order to defend domestic violence cases, I rely upon a strong emphasis on using very experienced private investigators in order to ensure the best results.

    21 years

  4. Expungement
    If you have a prior conviction, then talking to a lawyer about how you can clean your history can help your professional career.

  5. Violent crime

I maintain a private criminal law practice. Currently, I represent people primarily in Lake and Mendocino Counties. I have completed approximately 50 jury trials (felony and misdemeanor trials) in Colusa County, Humboldt County, Lake County, Mendocino County, and Napa County. Argued numerous preliminary hearings, hearings, hearings, suppression hearings, motion to strike prior convictions, speedy trial motions, 995 motions, Pitchess motions, writs of mandamus and prohibitum, habeas corpus petitions, and misdemeanor appeals. In writ proceedings, I successfully argued a prior misdemeanor conviction was unconstitutional and that resulted in the allegation being dismissed. This relieved the client of his duty to register as a sex offender. I have handled many felony cases of all levels of difficulty and I am very well versed in the strike laws as well as how out of state strikes can be challenged when the prosecution tries to apply them to a California felony. Additionally, I help many people clean their record of prior convictions.  Many marijuana felonies are now reducible to misdemeanor as well as many felony simple drug possession charges.  Since 2015, California has greatly expanded a person's ability to clean their criminal history.  Most recently, California has instituted a process for some to remove themselves from sexual registration per PC 290.  I have successfully defended numerous misdemeanor DUI appeals. Assist other fellow misdemeanor and felony attorneys with legal research regularly. I am a listed Contributor to California Drunk Driving Law, James Publishing, by Paul Burglin, Barry Simons, and Ed Kuwatch


Client's Choice 2012,2011
Client's Choice
2012 2011


Law Office of William Conwell
301 North Forbes Street, Ste. C
P.O. Box 395
Lakeport, CA, 95453-4723


4.9 / 5.0
  16 customer reviews
5 Star
4 Star
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1 Star
Client's Choice 2012
Client's Choice
Client's Choice is an Avvo award granted to attorneys with a significant number of client reviews over 4 stars in a given year.
Posted by Magid nabavi | October 26, 2022
This review is from a person who hired this attorney.
| Hired Attorney
He is a very honest good lawyer who even works on Sundays
I got referred to William conwell by a friend who had used him in the past and was very pleased with the outcome of his case my personal experience is hes very friendly very honest hes always there when you call hes always there when you have questions he works very hard for you he works on weekends works overtime to make sure your case has a good outcome and that you are very happy with his work he is worth every penny I highly recommend Mr. Conwell he has a very good criminal mind and hes a very good lawyer very well rounded you will not be disappointed please call him today!!! Thank you
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Posted by anonymous | August 30, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Consumate professional
Bill offers just the right balance of warmth and professionalism. He's able to share his knowledge of the law with ease and grace, and to top it off, affordability. Thanks for your service. Highly recommended.
Posted by Randy | October 3, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Very impressive man
Was being charged with 8 felonies. the day before trial this man had it all dropped. Very knowledgeable professional and caring attorney. Highly recommend him.
Posted by Jeff | January 15, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Amazing man!!!
William conwell represented me on 2 occasions both times he put forth 100% effort he listened he cared and he genuinly cares for his clients. He did everything he possibly could to assist me and got me the oppertunity that changed my life. Hes the best attorney there is i highly reccomend this man hes the best
Posted by anonymous | December 4, 2014
Best Lawyer Ever!!!
I was wrongfully accused in a DV case in Clearlake, California which is not a easy situation to get out of as I soon found out , some how ? However, after meeting Bill (as we call him), I knew in two words that he was a down to earth and empathetic human being and that at the same time meant business. He explained everything just like it was with no false promises. I liked that! (Who wouldn't?) Most of all, I didn't know how but I knew I was going to be ok. He even has an investigator at his disposal and they all worked around the clock for my rights. Bill fought for me tooth and nail like I was his son, and I definitely take my hat off to my Lawyer William Conwell for my Freedom, my education and the well being of me and my family. A million thanks to Bill for fighting for me. Jail is not a place anyone wants or needs to be if innocent. I highly recommend this Lawyer and his partners at his Law Office and practice.
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Posted by Joyce | August 7, 2013
Junvenile case
Bill is an open minded person, and will keep you informed about your case. He has a very calming temperment, which makes it a little easier when he has to tell you something you really don't want to hear. He took our case on a last minute situation, and has been there for us all the way. We are still fighting our case, but because of his calm and straight forward personallity, he has been very easy to work with. He is dedicated to your cause, and works extreamly hard on researching what can and can't happen. Knowing all the facts, good or bad, is always helpfully so you are prepared for what every happens in court. He is patient, even when your not, but has a way of calming you down,. Bill sets the bar high for other attorneys' to follow. I highly recommend him.
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Posted by Dana | June 22, 2012
Amazing Attorney
I had the best experience with Attorney Conwell. When no other Public deffenders wanted to check into case studies I was inquiring about Attorney Conwell went above and beyond. He not only checked, he had copies of the information I was inquiring about. Even as a public defender this man's hard work, determination, and integrity, far surpassed my expectations. I would definitely recommend Attorney Conwell to all. He's guaranteed to work hard for your case!
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Posted by Phil | April 4, 2012
Excellant job. Got DUI charges dismissed as CHIP had no probable cause to pull me over. Bill keep me informed, was easy to call, and I only had to attend one hearing. Well worth the $ 1500.
Posted by Bezos | September 28, 2011
Professional And Honest
William Conwell gave me great consultation and advice. He was honest and upfront about the whole situation and unfortunately could not help me with my case to go after a company for fraud. In the consultation he was attentive and answered questions and if he did not know an answer he clearly stated he did not as he did not want to give false information or steer in the wrong direction, which I appreciated. It was due to his professionalism that I have recommended him to the type of cases he does handle, which are criminal defense cases.
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Posted by Donald | September 14, 2011
Did a GREAT job for me
Mr. Conwell took on the L.A. County bureaucracy , fought through their red tape, and ignorance, and won for me. The only attorneys that would touch this case wanted to get rich. William Conwell was my HERO in a time that I needed one.
Posted by James | August 16, 2011
A God of Law
Mr. Conwell is one of the most knowledgeable and brightest legal minds I have ever known. His expertise in the legal profession spans not only representation of his clients at the Superior Court level but if necessary at the Appeals Court level too. This is an attorney who not only represents his clients but sets precedents for others to follow. He is not a large law firm attorney with a huge staff to do his work for him but instead a grass roots attorney with a sharp mind that allows him to defend his clients with the best possible outcomes. If you need an attorney who will defend your case and fight for what is right then this is that attorney. I have great admiration for this legal wizard and would recommend him to anyone who needs legal representation or consultation. I sincerely hope that someday this attorney becomes a judge as the justice system will be a better place for having him. Don't make a mistake in choosing another attorney when this one is the best.
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Posted by anonymous | March 31, 2011
DUI case dismissed
My DUI case in Lakeport occurred on 3/29/2009. I switched attorney on 1/31/2011 when I signed up for the services of Mr. Conwell. Exactly 2 years from the date of my DUI arrest, on 3/29/2011, Mr. Conwell was successful in getting my DUI case dismissed (it was originally set to go to trial on 4/11/2011). Mr. Conwell is a man of integrity and he was very good in keeping me posted of all the happenings and upcoming events of my case. I strongly recommend the services of Mr. Conwell.
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Posted by anonymous | January 2, 2011
Small Case- Big Results
A small traffic case that would have raised my insurance and impacted my drivers license record was expertly handled by William Conwell. I got an acquital.
Posted by anonymous | December 15, 2010
We recomend William Conwell
Mr. Conwell represented our son. He is courteous and doesn't overstate your chances.He knows his business and understands the financial burden your under and will work hard to win, and we did win!!! After a year long game in the courts and much stress, we went to trial, that is where Mr. Conwell showed his expertise. Our son has now maintained his perfect record. Thanks to Mr. Conwell and to our God and Saviour Jesus Christ for the predestinated outcome.
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Posted by anonymous | September 6, 2010
A pit bull attorney who will stop at nothing to protect your rights.
Bill Conwell is a rare breed of attorney who delivers what others only promise. He works nights and weekends to make sure your case is prepared completely. His dedication to his clients is second to none. A lot of attorneys make big claims, Bill Conwell actually delivers. From DUIs to homicide, Bill Conwell is your best choice in Lake County.
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Posted by anonymous | September 6, 2013
Very Professional
I hired Bill after I was going through a long a drawn out court process that was never ending! After one hearing I was able to get resolution. He is very patient and listens to your concerns and simply wants to help! I am very grateful for his help and the way he was able to "simplify" a complicated mess. Thank you!
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  • Free Consultation 60 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.4 (Excellent)

Work Experience

  • Associate
  • Tim A. Pori
  • 2005 - 2006
  • Of Counsel
  • Joshua M. Dale, Esq.
  • 2004 - 2005


  • New College of California School of Law
  • JD - Juris Doctor
  • 2002
  • New College of California
  • BA - Bachelor of Arts
  • 1999

Sample of Legal Cases

  • DUI dismissal
  • Case dismissed.
  • Sex registration case
  • Charges dismissed and PC 290 registration requirement eliminated.
  • Lake County Marijuana Trial
  • Not guilty all counts
View all legal cases


  • National College of DUI Defense
  • member
  • 2011 - Present
  • member
  • 2010 - Present
  • California NORML
  • member
  • 2010 - Present
  • The Private Defenders
  • member
  • 2010 - Present
  • National Association of Criminal Defense Lawyers
  • member
  • 2006 - Present
  • California DUI Lawyers Association
  • Member
  • 2004 - Present
  • California Public Defenders Association
  • member
  • 2004 - Present
View all associations

Honors and Awards

  • Friend of the Veteran
  • Lake County Board of Supervisors and County Veterans Service Office
  • 2022
  • Top Rated Lawyer
  • Avvo
  • 2019
  • Top Rated Lawyer
  • Avvo
  • 2018


  • New College of California Journal of Public Interest Law
  • Same Sex Marriage in a Free Society
  • 2002

Speaking Engagements

  • Discussion on Prop 47
  • Prop 47
  • 2014
  • Effect of DUI arrest on a driver's license
  • Importance of asking for a DMV Hearing
  • 2011
  • Clearing Your Criminal Record
  • Expungement, 17b motion, and Factual Innocence
  • 2010
View all speaking engagements

Attorney endorsements

Received (20)
Given (37)
Endorse William
Violent crime Attorney | Aug 31
Relationship: Fellow lawyer in community
"I endorse Bill without reservation. Bill's a real warrior. Bill and I have helped each other out over the years on serious criminal cases by sharing ideas and documents. Bill routinely tries cases where the sentencing exposure is 20 years-plus. But you wouldn't hear that from him; he's that humble. Bill's a whip smart, quiet assassin. I can vouch personally for Bill's work-product and trial skills. I only review people I know personally and for whom I'm able to vouch for their work in a true, substantive way. Such is the case with Bill. He's a man about his business, and he has my respect -- and the respect of the bench and bar statewide. Just an all around great guy and truly competent criminal defense attorney."
Unknown Attorney | Feb 17
Relationship: Other
"Great attorney who works hard to get the best results for clients. I endorse this lawyer."
DUI and DWI Attorney | Dec 12
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Criminal defense Attorney | Sep 19
Relationship: Fellow lawyer in community
"I endorse this lawyer's work."
DUI and DWI Attorney | Mar 15
Relationship: Other
"I endorse this lawyer Bill because he is a fighter in the representation of his clients. I have seen Bill handle motions in DUI cases, and he has the knowledge that it takes to win. He is one of those lawyers that stays with a case to make sure that he gets the best results for his clients. If you have had a recent DUI in Bill's area, he is the lawyer for you."
Criminal defense Attorney | Sep 24
Relationship: Fellow lawyer in community
"I endorse this lawyer. I had the opportunity to work with Bill Conwell for the better part of a year in Lake County. His knowledge of Criminal Practice and his courtroom demeanor are second to none in Lake County. I would recommend him anyone seeking a zealous advocate."
Criminal defense Attorney | Jul 23
Relationship: Fellow lawyer in community
"William is a highly experienced and successful attorney. He has handled trials, writs, appeals, motions, and knows just about every aspect of the criminal justice system. His commitment to his work and his clients, and the respect he has in the community say everything about this attorney. I recommend him without reservation."
DUI and DWI Attorney | May 27
Relationship: Worked together on matter
"Bill is extremely generous with his time, and always has a smile. We discuss my cases from time to time and he always has a nuance to add that lights up an aspect that I had not yet considered. A Very solid colleague..."
DUI and DWI Attorney | Apr 22
Relationship: Fellow lawyer in community
"Bill is a great lawyer and someone who works to provide his clients with top-notch representation. I highly recommend hiring his office in any DUI or criminal defense matter."
Criminal defense Attorney | Apr 18
Relationship: Fellow lawyer in community
"If you find yourself in need a true warrior spirit - Mr. Conwell is clearly an excellent choice. He is a member of the California DUI Lawyers Association, has successfully defended all kinds of criminal cases, and has an excellent reputation for doing so. I've known him for quite some time and if he takes your case, you should feel confident that you are in good hands."
DUI and DWI Attorney | Jan 31
Relationship: Fellow lawyer in community
"Will is a fine lawyer with significant knowledge of DUI and DMV law and procedure. He is a professional and a pleasure to work with."
DUI and DWI Attorney | Oct 09
Relationship: Fellow lawyer in community
"I endorse this lawyer. I've been practicing several years and feel confident that I know what I'm doing. Still, when I do need someone to point me in the right direction on a legal issue, particularly on DUI issues, it's Bill."
Criminal defense Attorney | Sep 02
Relationship: Fellow lawyer in community
"I endorse this lawyer. I have the immense pleasure to be in an ongoing legal workshop with Bill. Not only is Bill a great criminal defense and DUI lawyer, he is a teacher and a mentor. Other lawyers learn from him and are better lawyers because of him. As a lawyer, I benefit from having Bill in this workshop. It gives me great pleasure to endorse Bill."
Criminal defense Attorney | Aug 17
Relationship: Fellow lawyer in community
"I have observed Mr. Conwell in various courts, and on numerous occassions, for the last 2 and 1/2 years. He is an exceptional attorney who comes to court well prepared, having researched the legal issues that will be argued. Many times I have seen the judge continue matters, as Mr. Conwell presented arguments that the judge was not even familiar with and had to go research himself. Mr. Conwell puts 110% into representing his clients. I have seen him go above and beyond the call of duty numerous times. I have even observed him step in and help an unrepresented person in court, just out of his concern for justice. Mr. Conwell is thoroughly versed in all criminal defense, including misdemeanors, felonies, and DUI's and I would not hestitate recommending his services to anyone."
DUI and DWI Attorney | Jan 16
Relationship: Fellow lawyer in community
"I highly recommend Bill Conwell for DUI and Criminal Defense. He is knowledgeable, diligent, and aggressive. Whether he is in court or at the DMV he works tirelessly for his clients and he gets results. If you hire Bill to handle your DUI or criminal case you can rest assured that you are in good hands."
Criminal defense Attorney | Jan 03
Relationship: Fellow lawyer in community
"Bill is an extremely dedicated and effective counselor of law. I've observed him in court and know he obtains outstanding results in the Lake County courts for his clients. He is highly respected by both the judges as well as the local district attorneys office for his knowledgeable zealous advocacy and his understanding of the legal nuances of criminal law is first rate. I strongly recommend him to anyone who must deal with the serious life changing effects that felonies or misdemeanors bring."
DUI and DWI Attorney | Sep 08
Relationship: Fellow lawyer in community
"I endorse this lawyer's work. He has a very thorough understanding of DUI laws and DMV procedures."
DUI and DWI Attorney | Aug 11
Relationship: Fellow lawyer in community
"Mr. Conwell an experienced criminal and DUI defense trial attorney who believes in honest work for and honest dollar. I wouldn't hesitate to hire Mr. Conwell if I ever needed to be represented in a criminal or DMV case."
DUI and DWI Attorney | Jun 25
Relationship: Fellow lawyer in community
"I endorse this lawyer's work. Bill worked for and is endorsed by Joshua Dale who is one of the finest lawyers and most politically most active lawyers in the state and CDLA. Bill is a with out doubt the most qualified and best lawyer in criminal as well as DUI/DMV law in his area. I have been a lawyer 38 years and specialize in criminal and DUI defense only and know who the best attorneys are. He is one of them...Joe Vandervoort... ..Chico"
DUI and DWI Attorney | May 16
Relationship: Supervised lawyer
"William Conwell was my associate and he now is on his own at a private defender's office in Lake County, California - he is a fine lawyer and you should be so lucky to have Bill defend you. No matter your criminal charge, he can assist you. Don't hesitate contacting him."
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Avvo Contributions

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Lakeport DUI and DWI Lawyer William Conwell
William Conwell
DUI and DWI Attorney
Lakeport, CA
Licensed for 20 years
Free Consultation