Sulfuric acid Tier II reporting threshold
Yes — once you hold 500 pounds or more of Sulfuric acid at any one time during the year. Count the acid itself, not the whole liquid. That is roughly 136 gallons of 35% battery acid (500 lb ÷ 0.35 ÷ 10.5 lb/gal), or about 35 gallons of 93% acid (500 lb ÷ 0.93 ÷ 15.3 lb/gal).
The number that counts is the most you had on site at one time, not the total you bought over the year, and not what is there today.
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- Extremely hazardous substance?
- Yes — extremely hazardous substances have their own, lower limits.
- Threshold planning quantity
- 1,000 pounds
- CAS number
- 7664-93-9
- Other laws that set their own number
- Clean Water Act response planning: 1,000,000 pounds. We are not telling you that you owe it — it has a second condition on top of the amount, and most small sites fall outside it: the rule only reaches a site close enough to navigable water to be expected to discharge into it.40 CFR 118.3
- If it spills
- A release of 1,000 pounds or more in 24 hours has to be reported immediately, whether or not you file a Tier II.40 CFR 302.6(a) — immediately, in any 24 hours · 40 CFR 355 subpart C
- Weight to volume
- 10.5 pounds per gallon. battery-strength sulfuric acid, about 35% — specific gravity 1.26⚠️ A representative figure — section 9 of your own safety data sheet beats it.
40 CFR 370.10 — 500 pounds or the threshold planning quantity, whichever is lower · 40 CFR 370.14(c) — count the chemical by its weight percent · 40 CFR 370.45(a) — filed on or before 1 March each year
Your state may set a lower limit
7 of the states we have read set the threshold itself below the federal one: OR, CA, VT, LA, AK, DE, OH.
5 more are strict in a different way — NC, MO, NV, NJ, RI keep the federal numbers but add a separate filing or cover more chemicals. Those are not the same thing, and we do not call them the same thing.
Where we have not read a state’s own code, we say so rather than guess.
Every rule we apply, with its sourceFind out for your site
Sulfuric acid is one chemical. The filing counts everything you keep, added up across every place you keep it. The checker works that out and shows the rule behind each number.
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