A home inspection water test is a laboratory water-quality panel a buyer orders alongside the standard inspection, because neither a general home inspection nor a pest inspection analyzes what is dissolved in the water itself. Santa Clara County inspectors who mention this add-on at the walkthrough give buyers time to fit lab results inside the standard contingency window, and give themselves a service line that costs the inspector nothing to offer.
What Does a Standard Home Inspection Actually Leave Out?
A general home inspection checks the water heater, the visible plumbing, and water pressure at the fixtures. It does not analyze what is dissolved in the water itself.
A standard inspection covers:
- The water heater and its connections
- Visible supply and drain plumbing
- Water pressure and flow at the fixtures
None of that requires a laboratory, and none of it reports lead, nitrate, arsenic, or other dissolved parameters. The gap sits next to two add-ons buyers already know to request: sewer-line video and radon testing. Water chemistry works the same way, available and useful on wells and older city plumbing alike, but only when someone orders it separately.
Do Lenders Require a Water Test on Santa Clara County Properties?
It depends on the loan program and the water source. FHA, VA, and USDA loans set conditional water-quality requirements for wells that conventional loans skip.
Under HUD Handbook 4000.1, FHA loans do not require automatic testing of a private well unless state or local jurisdiction mandates it, the water is suspected of contamination, a water treatment system addresses existing contaminants, or the lender itself asks for one; when a test is required, the local health authority’s standard applies, or the EPA’s maximum contaminant levels where no local standard exists. VA Pamphlet 26-7, Chapter 12 holds individual water supplies on VA loans to that same local-authority-or-EPA standard, with the sample drawn by a disinterested third party rather than the buyer, seller, or agent. USDA-guaranteed loans on well-served properties generally call for a water test from a laboratory meeting the state’s testing standards, checked against EPA-based potability limits, including a nitrate limit of 10 mg/L.
Across all three programs, the numbers on the report are the lender’s water quality items: nitrate at 10 mg/L, nitrite at 1 mg/L, and lead, whose federal action level is 0.015 mg/L today and drops to 0.010 mg/L once the Lead and Copper Rule Improvements fully phase in on November 1, 2027. City-water buyers on conventional loans face no such requirement.
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Order a Water Test →What Does California Law Actually Require at Transfer?
California’s Transfer Disclosure Statement, required under Civil Code Section 1102 for most residential sales, asks the seller to state whether the water supply is the city or a well and to disclose known material problems with it. It does not require a water test.
A seller with no test on file discloses only what they know, which for water chemistry is frequently nothing, since most contaminants that matter have no taste, odor, or color at the concentrations that count. A buyer’s own test, ordered inside the contingency period, is the only way anyone in the transaction learns the actual numbers.
Which Package Fits a Well or City-Water Property?
The property’s water source decides the panel. KELP’s Real Estate Well Water panel ($199) covers wells; city-water homes fit the Essential ($199) or Complete ($249) tiers.
Order the panel that matches what’s under the property:
- Private well, standard transaction: Real Estate Well Water ($199)
- City water, pre-1986 plumbing: Essential Home ($199)
- City water, full chemistry request: Complete Home ($249)
- Documented risk nearby (industrial, agricultural, military): Ultimate ($549 to $699), which adds a full PFAS panel to the metals and chemistry base
| Property type | Recommended panel | Price | What it reports |
|---|---|---|---|
| Private well, standard transaction | KELP Real Estate Well Water | $199 | 10 metals (incl. lead), alkalinity, hardness, TDS, fluoride, nitrate, nitrite, sulfate, chloride |
| City water, pre-1986 plumbing | KELP Essential Home | $199 | Heavy metals (lead, arsenic, copper), hardness and minerals |
| City water, broader chemistry request | KELP Complete Home | $249 | Adds aluminum, cadmium, mercury, fluoride, nitrates, bromides, phosphates |
| Near industrial, agricultural, or military sites | KELP Ultimate | $549 to $699 | Adds a full PFAS panel to metals and chemistry |
If the listing is on a private well, the decision defaults to the $199 Real Estate Well Water panel. The Ultimate tier is worth raising only where a specific nearby risk exists.
How Does a Home Inspection Water Test Fit the Contingency Window?
California’s standard purchase agreement, C.A.R. Form RPA-CA, gives buyers 17 days after acceptance for inspections by default. KELP reports 5 to 7 business days after the lab receives the sample.
Ordered the day the offer is accepted, a panel reports with roughly ten days still open inside a standard 17-day window, and the prepaid return label is already included. That sequencing only works if the inspector raises the option at the walkthrough rather than after the contingency has already closed. A kit ordered by day 10 of 17 usually reports in time, and the odds get worse with each day after that.
How Do Inspectors Offer This as an Add-On, and Who Pays?
Offering the test costs the inspector nothing beyond a mention. Payment is negotiable the same way any other inspection add-on is.
The add-on works in three steps:
- Mention the option at the walkthrough or listing appointment, before the contingency clock is running low.
- Point the buyer to the panel that matches the property: well or city water, standard or higher-risk.
- Let KELP handle collection-to-lab logistics; the kit ships directly to the buyer or agent, and a prepaid label returns the sample to the Sunnyvale lab without the inspector holding inventory.
If you are advising a buyer on a well-water listing, order the Real Estate Well Water panel the day the offer is accepted; for a city-water listing with plumbing from before 1986, the Essential Home panel covers the same window. Buyers typically order and pay as part of due diligence, and some well-property sellers test proactively so a documented recent panel is already available when the first offer comes in.
Our how to choose a water testing lab guide covers the five checks behind any lab recommendation, and our well water testing guide explains what each result means once the report is back. This page covers the inspector’s add-on decision; it does not cover the buyer’s own step-by-step testing walkthrough, which our home-purchase testing guide handles directly.
Frequently Asked Questions
Does a home inspection include a water test?
No. A standard home inspection covers visible plumbing, the water heater, and pressure at the fixtures, not water chemistry, which requires laboratory analysis ordered separately as an add-on.
Is water testing required to close on a house in Santa Clara County?
Only when a specific lender program requires it. FHA, VA, and USDA loans carry conditional water-quality requirements for well-served properties; conventional loans and city-water properties generally do not, and Santa Clara County has no county-level testing mandate at transfer.
How long does a home inspection water test take?
KELP reports 5 to 7 business days after the lab receives the sample. Ordered at offer acceptance, results typically land with about ten days remaining inside California’s standard 17-day contingency period.
How much does a home inspection water test cost?
KELP’s Real Estate Well Water panel is $199. City-water panels start at $199 for the Essential tier and $249 for the Complete tier, with a PFAS-inclusive Ultimate tier at $549 to $699 for properties with higher risk factors.
KETOS Environmental Lab Services
KETOS Environmental Lab Services (KELP)
520 Mercury Dr, Sunnyvale, CA 94085
(408) 357-4745
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Order a panel at kelp.ketos.co/order-form or call (408) 357-4745 for volume pricing.
Sources: California Civil Code Section 1102 (Transfer Disclosure Statement requirement); HUD Handbook 4000.1 / HOC Reference Guide on individual water systems; VA Pamphlet 26-7, Chapter 12; USDA Rural Development single-family water quality guidance; EPA National Primary Drinking Water Regulations (nitrate, nitrite, lead action level); C.A.R. Form RPA-CA Section 14(B)(1); Santa Clara County Department of Environmental Health well construction and water system clearance program; KETOS KELP panel specifications from ketos.co. All checked September 17, 2026.
