Hillsborough County water report · Northwest Utilities (Hillsborough County)
What's in Northwest Hillsborough tap water
Northwest Utilities (Hillsborough County) serves about 206,485 people. Its own testing from 2013 to 2024 shows 11 contaminants above EWG health guidelines, led by HAA9 at 307× the guideline. Its averages are within today's federal legal limits.
Hillsborough County's Northwest service area. The City of Tampa runs its own system, which isn't in this report yet.
Every result above the guidelines
Types found here: Disinfection by-products, Radioactive elements, Metals.
| Contaminant | Average level | EWG health guideline | Federal legal limit | Times the guideline |
|---|---|---|---|---|
| Haloacetic acids (HAA9)Disinfection by-products | 18.4 ppb | 0.06 ppb | No federal limit | 307× |
| Haloacetic acids (HAA5)Disinfection by-products | 22.1 ppb | 0.1 ppb | 60 ppb | 221× |
| Total trihalomethanes (TTHMs)Disinfection by-products | 31.9 ppb | 0.15 ppb | 80 ppb | 213× |
| Trichloroacetic acidDisinfection by-products | 9.14 ppb | 0.1 ppb | No federal limit | 91× |
| ChloroformDisinfection by-products | 26.2 ppb | 0.4 ppb | No federal limit | 66× |
| BromodichloromethaneDisinfection by-products | 3.83 ppb | 0.06 ppb | No federal limit | 64× |
| Dichloroacetic acidDisinfection by-products | 9.65 ppb | 0.2 ppb | No federal limit | 48× |
| Dibromoacetic acidDisinfection by-products | 1.04 ppb | 0.03 ppb | No federal limit | 35× |
| Radium, combined (-226 and -228)Radioactive elements | 0.87 pCi/L | 0.05 pCi/L | 5 pCi/L | 17× |
| DibromochloromethaneDisinfection by-products | 1.18 ppb | 0.1 ppb | No federal limit | 12× |
| Chromium (hexavalent)Metals | 0.0690 ppb | 0.02 ppb | No federal limit | 3.5× |
What treats it
- Disinfection by-products (trihalomethanes, haloacetic acids and related compounds) form when chlorine or chloramine reacts with natural matter in the source water. Carbon filtration is the most common way to reduce them, and every Whole Home package includes a whole-home carbon stage, so it covers every tap and shower.
- Radioactive elements, Metals: reverse osmosis is the usual treatment for these at the tap you drink from. Our drinking-water tap add-on ($695) is a reverse osmosis system under the kitchen sink.
- Hard water isn't in this data. If you see white crust on faucets or shower glass, Filtration + Softening adds a softener for the scale.
We don't install in Northwest Hillsborough yet
We open an area once a licensed local plumber has signed on. Leave your number and we'll text you the day we do.
Questions about Northwest Hillsborough water
Does Northwest Utilities (Hillsborough County) water meet federal standards?
Its averages are within today's federal legal limits. EWG's health guidelines are far stricter than legal limits, which is why its testing shows 11 contaminants above them. The figures are averages of the utility's own testing from 2013 to 2024.
What is HAA9, and why is it the highest in Northwest Hillsborough?
Haloacetic acids (HAA9) is a disinfection by-product. It forms when the chlorine or chloramine used to disinfect the water reacts with natural matter in the source water. Northwest Utilities (Hillsborough County) averaged 18.4 ppb against EWG's guideline of 0.06 ppb, about 307× the guideline.
When will you install in Northwest Hillsborough?
We open an area once a licensed local plumber has signed on with us. Leave your number on this page and we'll text you when we do.
How much does whole-home water filtration cost in Northwest Hillsborough?
Our prices are the same everywhere we install: Whole Home Filtration is $2,995 installed, Filtration + Softening $4,495 and Total Protection $7,495, from about $64 a month on approved credit.
See how Northwest Utilities (Hillsborough County) ranks against 24 other large Florida systems in the Florida Tap Water Report 2026, or read what HAA9 and TTHM are.
Source: Northwest Utilities (Hillsborough County) on the EWG Tap Water Database, utility testing averages 2013-2024, compiled October 2026. EWG's health guidelines are far stricter than federal legal limits. Long-term averages describe the public supply, not any one home, and aren't the same as current compliance; see your utility's latest annual water quality report. Whole Home Company sells and installs home water treatment and isn't affiliated with any utility or with EWG.