About LACO

Who is LACO?

When asked that question, the answer often begins phonically.  We are LAY-co, a 75-employee multidisciplinary engineering consulting team with offices in Eureka, Ukiah, Santa Rosa, and Chico. We’re also a part of your community, your neighborhood, and your everyday life – whether it’s relying on clean water, safe roads, reliable energy, land development, or other infrastructure systems. We’re always looking out for the long-term health of the planet – preserving wetlands, restoring habitat, and addressing environmental concerns.

For a specialized problem, you need a specialized solution. More complicated problems, however, often demand multiple solutions that require expansive knowledge. LACO Associates offers a range of services that draw upon skilled experts to seamlessly address your projects, small or large, simple or complex. Together, we’re your personal project manager.

LACO is a C Corporation and is a certified California Small Business.

LACO Core Values

These statements enable us to “SEE” continuity in our thoughts and actions, supporting your project’s success.


Concern, communication, competence, timeliness, fulfillment, value

We learn, understand, and embody your concerns – and respond promptly. Our goal is to earn your satisfaction through our commitment to measurable, meaningful results.


Sincerity, integrity, trust, standards, conduct

We conduct our affairs with rigorous standards that care for your concerns, as well as those of our employees, organization, colleagues, shareholders, partners, and community. Our goal is to earn your trust through our integrity, sincerity, and technical expertise.


Knowledge, technology, accomplishments, leadership, organization, identity

We invest in people and their accumulation of knowledge, technology, and leadership skills that enable us to produce notable accomplishments and strengthen our identity. Our goal is to help you succeed by providing exceptional services.

LACO History

Since Ilmars Lagzdins first opened the doors to LACO’s Eureka office in 1954, we’ve grown into a firm that primarily serves eight counties and continues expanding. Years later, Lagzdins welcomed a new partner to the firm in Guy Conversano, the former City of Arcata Director of Public Works. Together, they incorporated the business in 1975 and came up with the name for their company, drawing upon their own last names for inspiration. Lagzdins contributed the “LA” and Conversano the “CO,” adding “Associates” to form a name that is recognized throughout the industry.

Despite the growth in employees, geography, and reputation, LACO has retained the responsiveness and flexibility of a small firm while developing a broad perspective of our client’s needs. We rely on collaboration and commitment to get the job done with an earnest focus on our clients.

Guy Conversano
Ilmars Lagzdins

Our team members recognize that their success as professionals is contingent upon the success of your project, and we have the expertise to help you succeed. That expertise includes providing services for engineering, design, planning, permitting, and regulatory compliance. We also offer engineering geology and geotechnical engineering, environmental science, land surveying, and materials testing and special inspection.