science

Sole Source Aquifer

Sole Source Aquifer is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sole Source Aquifer rather than just read about it. In short: A Sole Source Aquifer (SSA) is an aquifer that has been designated by the United States Environmental Protection Agency (EPA) as the sole or principal source of drinking water for an area. By definition, SSA is an aquifer that supplies at least 50% of the drinking water consumed in the area overlying the aquifer.

Key takeaways

Sole Source Aquifer belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sole Source Aquifer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sole Source Aquifer from memory before moving on to harder problems.

Reference excerpt

A Sole Source Aquifer (SSA) is an aquifer that has been designated by the United States Environmental Protection Agency (EPA) as the sole or principal source of drinking water for an area. By definition, SSA is an aquifer that supplies at least 50% of the drinking water consumed in the area overlying the aquifer. There may be other factors to designate SSA. For example, in New York City, Kings and Queens Counties are designated as SSA not because the aquifer of these areas are the sole or principal sources of drinking water for these counties; they are designated as SSA because the geographic boundaries of Kings and Queens Counties are within the recharge zone for the aquifers underlying the southeastern portion of Queens County. Groundwater beneath Manhattan and the Bronx is not used for drinking or non-potable purposes. These areas may have no alternative drinking water source(s) that could physically, legally and economically supply all those who depend on the aquifer for drinking water and therefore, if contamination occurs, using an alternative source would be extremely expensive. SSA designation works as a tool to protect drinking water supplies in these areas.

Worked examples

Example 1 — a first encounter with Sole Source Aquifer

Start with the simplest possible case. Write down what Sole Source Aquifer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sole Source Aquifer before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sole Source Aquifer ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sole Source Aquifer

In research: Sole Source Aquifer appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sole Source Aquifer in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sole Source Aquifer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquifers, Aquifers in the United States, Drinking water, so understanding it makes those chapters shorter.
In everyday life: Look for Sole Source Aquifer outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sole Source Aquifer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sole Source Aquifer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sole Source Aquifer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sole Source Aquifer in simple terms?

Why does Sole Source Aquifer matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sole Source Aquifer?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sole Source Aquifer.