hcplumbing.com — Harry Clark Plumbing and Heating Inc. | Oakland & Berkeley, CA

Entity Identity gdr-6d496a6e · minted 2026-05-12T22:12:43Z

◈ Source http://www.hcplumbing.com/ ↗

◈ This record is claimable · Verified entities are cited by AI systems

Claim Entity Profile →

COM · Entity Record

hcplumbing.com

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◈ Entity Topology Map

gdr-6d496a6e · v1.0.0 · Law III+V+VI

Latin dominant · moderate lexical diversity · short-form declarative register · high clause nesting · moderate topic focus · strong uncommon edge signal

Federation ID

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Interior Pages

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Minted At

2026-05-12T22:12:43Z

Law I — Provenance · Law II — Temporal Attestation Visit hcplumbing.com ↗

SEO Record extracted from http://www.hcplumbing.com/

Title

Harry Clark Plumbing and Heating Inc. | Oakland & Berkeley, CA

Providing HVAC & Plumbing Services in Oakland & Berkeley, CA

Meta Description

For quality HVAC & plumbing services in Oakland & Berkeley, CA call Harry Clark Plumbing and Heating! We provide HVAC, plumbing, and sewer repair & installation.

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Word Count

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Full Extracted Text Corpus 10,211 chars · 1,658 words · 1 pages · Law I

Everything hcplumbing.com said about itself — extracted verbatim from 1 pages, 1,658 words total. No editorial layer. No inference. Law III — the text is the measurement. Meaning is the reader's. Minted: 2026-05-12T22:12:43Z

◈ Homepage — http://www.hcplumbing.com/Skip to content HVAC & Plumbing Service in Oakland & Berkeley, CA (510) 444-1960 or (510) 444-1776 Two Brothers, Two Buildings, Two Companies SAME GREAT SERVICE! 3040 Broadway, Oakland, CA 94611 (510) 444-1960 HEATING & AIR CONDITIONING 3026 Broadway, Oakland, CA 94611 (510) 444-1776 PLUMBING & SEWER Harry Clark started a plumbing company called Grand Ave Plumbing. The company led by Harry Clark moved to college Ave in 1941 and Piedmont Ave 1946 and changed the name to Harry Clark Plumbing. Providing HVAC & Plumbing Services in Oakland & Berkeley, CA Harry Clark along with his wife Madeline ran a successful neighborhood plumbing company for years. After Harry passed away Madeline realized she was not ready to retire or sell the company. On top of her experience working with her husband, she came from a family of plumbers and worked with her father when growing up. She decided to take over the business herself, she applied and succeeded in become a California Licensed Plumbing Contractor. She was one of the first women in the state to hold this type of license. In 1976 Mrs. Clark was finally ready to retire. She found Donald and Beverly Marshall, who had worked in the industry since 1952, to buy the company. Donald and Beverly continued the tradition of a local plumbing company specializing in service. They hired their youngest son Brad Marshall, a union trained Journeyman in 1985. By 1989 Donald and Beverly were ready to retire. They sold the company to there two sons Don and Brad Marshall. In 1994 Don and Brad bought a building at 3026 Broadway and moved the company from Piedmont Ave. In 2012 they bought another building 3040 Broadway. In 2020 they split the company into two, one Plumbing and Sewer and the other heating and air conditioning. Today, two brothers, two buildings, two companies working side by side to provide our customers with best in products and services. Stay tuned for the next generation of owners. Harry Clark • 3040 Broadway, Oakland, CA 94611 • Phone: (510) 444-1960 • 3026 Broadway, Oakland, CA 94611 • Phone: (510) 444-1776 This website or its third-party tools process personal data. We do not sell information from this website.Ok ◈ Interior Pages — 1 pages crawledHarry Clark Plumbing and Heating Inc. | Oakland, CA | Plumbing Service Skip to content Plumbing & Sewer Services in Oakland & Berkeley, CA (510) 444-1776  Request Service   Request Estimate Home About Water Heaters Storage Water Heaters Tankless Water Heaters Recirculation Pump Plumbing Plumbing FAQs Plumbing Repair & Service Sump Pump Repiping Plumbing Services Gas Line Repairs Drain Cleaning (Blockages) & Plumbing Services Mystery Plumbing Leaks and Repairs Hot & Cold Water Piping in Oakland & Berkeley, CA Pressure Reducing Valve Toilet Repair & Plumbing Services Shower and Tub Valves Sewer Trenchless Specialists Trenchless Sewer Repair Sewer Scope Inspection Gas Shut Off Valve Green Building Contact Reviews HVAC Home About Water Heaters Storage Water Heaters Tankless Water Heaters Recirculation Pump Plumbing Plumbing FAQs Plumbing Repair & Service Sump Pump Repiping Plumbing Services Gas Line Repairs Drain Cleaning (Blockages) & Plumbing Services Mystery Plumbing Leaks and Repairs Hot & Cold Water Piping in Oakland & Berkeley, CA Pressure Reducing Valve Toilet Repair & Plumbing Services Shower and Tub Valves Sewer Trenchless Specialists Trenchless Sewer Repair Sewer Scope Inspection Gas Shut Off Valve Green Building Contact Reviews HVAC Experienced Plumbing Services for Oakland, Berkeley, & the Surrounding Areas Are you experiencing problems with your plumbing, sewer, or hot water system? Trust an experienced local contractor to handle the problem. Harry Clark Plumbing has over 46 years of experience handling a variety of HVAC, plumbing, and sewer repair and service issues within the Oakland and Berkeley , CA areas. Get in touch with our team today to schedule you tankless water heater installation, plumbing service , or sewer repairs today! Trust Us for Sewer Repair, Water Heater Installation, & Other Plumbing Services! Our team at Harry Clark Plumbing Inc can provide several plumbing services for your residential or commercial properties. Our plumbing services include sump pump repairs or replacements, replacing pipes, gas line repairs, hot and cold-water piping, toilet repairs, unclogging drains, and more. We understand the urgency involved when it comes to plumbing services of any kind and the satisfaction of our customers is a top priority! We hope you choose us when you are looking for assistance with plumbing services. Sewer Repair You may not always consider your plumbing or sewer needs, but you always want to think about your sewer before you need to. Schedule your regular sewer inspection and service with Harry Clark Plumbing. If your property in the Oakland or Berkeley, CA area requires plumbing or sewer repairs, we can handle those too! Many local sewer repairs require replacement of the pipes: this can be a hassle, but we have the skills and experience to conduct your repairs with minimal disruption to your property. We install trenchless sewers that are easier to maintain and operate more efficiently, with less chance of failure over the life of the system. Contact us today to learn more about what we do or to schedule sewer repairs in the Oakland and Berkeley, CA area! Heat Pump Water Heaters Tank/Tankless Water Heater Drain Cleaning Stoppages Hydro Jetting Plumbing Repair & Service Toilet Repairs Gas Line Repairs Trenchless Sewer Replacement Sump Pump Hot & Cold Water Repiping Plumbing Tips Choosing a Trenchless Sewer Line as a Replacement Option Read More Plumbing Tips Read More 5 Common Plumbing Problems Read More Four Reasons to Purchase a Tankless Water Heater for your Home Read More Serving Oakland since 1946, any plumbing needs our expert plumbers have you covered. Harry Clark Plumbing is here to take the pain out of your plumbing needs. We provide prompt and courteous residential and commercial plumbing services to the Oakland and Berkeley, CA area and beyond. Our technicians are experienced and ready to handle any situation that arises, and we only use quality products like domestic made pipe and fittings. Request Service Request Estimate Customer Reviews Lori C. - Oakland, CA      It was during a big storm and Harry Clark was slammed. A huge tree had fallen and broken a water pipe and was flooding underneath the house. Electricity was out, tree was covering the valve to turn off water and East Bay Mud evaluated and could do nothing until the tree was removed. This could be days. Bradley managed to gather a crew with a generator and pump and was at the site within 30 minutes of the call. The guy pumped all the water out from under the house and with unbelievable ingenuity managed to get access to the water source and identify the broken pipe and clamped it down stopping all the water from rushing under house. It was a Superman moment!!! Thank you Harry Clark for responding to a 911 situation with all that was going on and being better than anyone expected!!! Leslie T.      I have had great results with Harry Clark Plumbing. They did such a great job from the 2000's until present day (yesterday- my old sump pump finally gave out) The sump pump well they installed has gotten compliments from drainage consultant to electrician working in that area of the crawl space- anyone who happens to be working in that area of my house has commented that "they did a very nice job on that pump well". Yes, it's true I'm sump pump proud. Thank you Harry Clark! On time, responsive, communicative, dependable, great work! Mike R. - Mather, CA      The entire company from the people that helped schedule the jobs to the service professionals that came out to our home were fantastic. We had a 100+ year old home in Oakland that had a gas line that was leaking in the kitchen and they were able to immediately identify the leak and replace the valve. They also hooked up our new gas range and did all the appropriate tests to confirm proper function and no additional gas leaks in the home. Separately we had them come out to install a new toilet in our downstairs half bath. Within an hour the new toilet was installed and running better than we could have hoped saving us water. Fast, efficient and fair priced for each service. Communication was outstanding We could not be happier and highly recommend. Sally Kahn      Positive: Professionalism, Quality, Responsiveness I had to have lateral sewer system replaced as it was shot. Everyone from office staff, workers on site, and owner was very professional, efficient, neat and friendly. While that was happening the supervisor on the job noticed a constant flow of water from the house and notified me, and Harry Clark got a plumber out right away and got that fixed too! Thank you to everyone at Harry Clark! Services: Outdoor plumbing system repair, Toilet repair Jan L.      Positive: Professionalism, Punctuality, Quality, Responsiveness, Value This review is long overdue-- for a number of years I have used Harry Clark for any plumbing or heating problem in my home or four plex. They communicate clearly, arrive when promised, work with my or tenant's schedules, fix the problem and give information about cause and prevention. Their pricing is fair and reasonable. The phones are always answered during business hours. After using different plumbers from time to time, it's come down to this one company I can depend on. If you are looking for one company to handle plumbing and heating issues, I recommend Harry Clark. Harry Clark Plumbing • CA License# 1056105 • 3026 Broadway, Oakland, CA 94611 • Phone: (510) 444-1776 Service Area: Alameda, Albany, Berkeley, Castro Valley, Concord, Hayward, East Bay, El Cerrito, Fremont, Moraga, Orinda, Oakland , Piedmont, Richmond, San Leandro, San Lorenzo, Union City & Walnut Creek Sitemap Yelp Google Lin

◈ Crawled Pages — Provenance Chain

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26%

Schema Utilization Score

PARTIAL COVERAGE — GAPS IDENTIFIED

schema.org v2.0.0 · 23 props extracted · 4 gaps · http://www.hcplumbing.com/

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      "url": "https://hcplumbing.com/",
      "name": "Harry Clark Plumbing",
      "alternateName": "Harry Clark Plumbing",
      "inLanguage": "en-US",
      "publisher": {
        "@id": "https://hcplumbing.com/#organization"
      }
    }
  ]
}

◈ Source: https://hcplumbing.com/plumbing-home/ · Fetched: 2026-05-12T22:12:50Z · Law I — Provenance

schema.org v2.0.0 · source: http://www.hcplumbing.com/ schema.org/BreadcrumbList ↗

Semantic Words 40 words · frequency ranked · Law III

▶ 40 words · top 5: plumbing · sewer · water · oakland · harry · click to expand

Top 40 words by frequency from http://www.hcplumbing.com/ + 1 interior pages (1,289 words total). Stop-words stripped. Ranked by repetition.

#1plumbing54x · 6.07%

#2sewer23x · 2.59%

#3water23x · 2.59%

#4oakland20x · 2.25%

#5harry20x · 2.25%

#6clark20x · 2.25%

#7services17x · 1.91%

#8service15x · 1.69%

#9repairs14x · 1.57%

#10pump12x · 1.35%

#11repair12x · 1.35%

#12berkeley11x · 1.24%

#13gas9x · 1.01%

#14broadway7x · 0.79%

#15heaters7x · 0.79%

#16sump7x · 0.79%

#17toilet7x · 0.79%

#18trenchless7x · 0.79%

#19line6x · 0.67%

#20valve6x · 0.67%

#21area6x · 0.67%

#22hvac5x · 0.56%

#23heating5x · 0.56%

#24tankless5x · 0.56%

#25hot5x · 0.56%

#26house5x · 0.56%

#27great4x · 0.45%

#28ave4x · 0.45%

#29ready4x · 0.45%

#30working4x · 0.45%

#31building4x · 0.45%

#32today4x · 0.45%

#33request4x · 0.45%

#34cold4x · 0.45%

#35system4x · 0.45%

#36handle4x · 0.45%

#37schedule4x · 0.45%

#38heater4x · 0.45%

#39piedmont3x · 0.34%

#40years3x · 0.34%

Law III — frequency measured, meaning is the reader's · source: http://www.hcplumbing.com/

Text Topology Fingerprint v1.0.0 · medium · 10,212 chars · Law III

Six-layer pre-linguistic shape measurement. Deterministic. Same input, same output, always. Hash: 0b992a406d6272e747a1b4377034d202...

◈ Signal Matrix

0.421

TTR

0.274

HAPAX

0.726

REP

0.287

BIGRAM

0.652

H2T

0.267

CPRT

5.337

SKEW

34.231

KURT

1.508

C/P

1.780

PENT

0.733

S1P

0.001

NASC

TTR=type-token ratio · HAPAX=hapax ratio · REP=repetition score · BIGRAM=bigram repetition · H2T=hapax-to-type · CPRT=capital token ratio · SKEW=sentence skewness · KURT=sentence kurtosis · C/P=comma-period ratio · PENT=punct entropy · S1P=single-sent para ratio · NASC=non-ASCII ratio

◈ Topology Position

Latin dominant · moderate lexical diversity · short-form declarative register · high clause nesting · moderate topic focus · strong uncommon edge signal

◈ Six Measurement Layers

Layer 1 — Character

0.0011

Non-ASCII Ratio

0.0 = Latin-dominant · 1.0 = fully non-Latin script

Layer 1 — Character

3.3316

Character Entropy

Shannon entropy of character distribution.

Layer 1 — Character

'e' (931x)

Most Frequent

Highest-frequency character. Law V — common edge.

Layer 2 — Token

0.4210

Type-Token Ratio

Unique tokens / total tokens. Lexical diversity signal.

Layer 2 — Token

0.2744

Hapax Ratio

Tokens appearing exactly once. Law VI — uncommon edge.

Layer 6 — Document

0.6519

Hapax to Type

Hapax count / unique token count.

Layer 3 — Punctuation

1.5079

Comma/Period Ratio

Clause complexity per sentence.

Layer 3 — Punctuation

1.7803

Punct Entropy

Shannon entropy across punctuation types.

Layer 4 — Sentence

Sentence Count

Total detected sentences across all crawled pages.

Layer 4 — Sentence

5.3370

Skewness

Positive = long-tail. Negative = conversational.

Layer 5 — Paragraph

0.7333

Single Sent Ratio

High = web copy. Low = academic prose.

Layer 6 — Document

0.7256

Repetition Score

Tokens appearing more than once / total.

◈ Token Length Distribution

1-3

32%

4-6

37%

7-10

28%

11-15

16-20

21+

◈ Density Gradient — TTR per Document Tenth

Front-loaded = abstract/preamble · Flat = consistent prose · Back-loaded = building complexity

◈ Lexical Richness Curve — Rolling Window TTR

Window=50 tokens · Step=25 · 65 data points

topology_fingerprint.py v1.0.0 · sha256: 0b992a406d6272e7... · Law III + Law VI

Ratio Signals 8 deterministic measurements · the gap is the signal

Eight deterministic measurements. Law I: every value traces to its source stage.

schema density

0.5750

Schema props extracted / top semantic words.

nav ratio

0.0000

Nav URLs / total internal URLs.

content to structure ratio

0.0097

Total words / raw HTML bytes. Content density.

external tld diversity

Unique TLD count in outbound links.

self declaration coherence

0.1763

Fuzzy overlap across title / H1 / meta / schema name.

schema to nav alignment

0.0000

Schema type tokens vs nav link text overlap.

javascript surface ratio

0.0000

Fraction of interior pages JS-gated.

URL Depth Distribution

depth_0: 2 · depth_1: 28 · depth_2: 0 · depth_3plus: 2

Internal URLs by path depth. Depth 0 = root.

Tech Stack · Security · Freshness SecurityLabel.MINIMAL · FreshnessLabel.STALE

Sitemap: ✗Robots.txt: ✗Schema.org: ✓Open Graph: ✗Canonical: ✓HTTPS: ✓HSTS: ✗CSP: ✗

Security

SecurityLabel.MINIMAL

Freshness

FreshnessLabel.STALE

Server

nginx/1.29.8

cms	WordPress
web_server	nginx/1.29.8
analytics	['Google Analytics', 'Google Tag Manager', 'Adobe Analytics']

Ledger Appends 7 ledgers · graph edge traversal · Law V+VII

Every ledger this entity appends to. Follow any link to see every other entity in the registry that shares that TLD or schema type. Law VII — Torus. The corridor never ends.

TLD LEDGER

.com

https://globaldataregistry.com/registry/tld/ledger/com ↗

SCHEMA LEDGER

breadcrumblist

https://globaldataregistry.com/registry/schema/ledger/breadcrumblist ↗

SCHEMA LEDGER

listitem

https://globaldataregistry.com/registry/schema/ledger/listitem ↗

SCHEMA LEDGER

organization

https://globaldataregistry.com/registry/schema/ledger/organization ↗