RS Clark Septic / Penn Valley Septic / Gold Country Septic in Grass Valley, California, offers professional and reliable septic tank services throughout Nevada County and surrounding areas. We are family owned and operated and never use subcontractors. We actually do our own work! Costs are determined by the merits of your septic tank and may include travel charges. We do not charge extra for after-hours service. Contact us today to set up a free estimate.