What contaminants are in DECATUR tap water?

Public data sources identify the following contaminants in DECATUR's water supply: Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Haloacetic acids (HAA5), Bromodichloromethane, Chloroform, Trichloroacetic acid, Dichloroacetic acid, Dibromochloromethane, Nitrate and nitrite, Chromium (hexavalent), Chlorate, Manganese, Strontium, Fluoride. Levels and comparison to EWG health guidelines are listed on the full city page.

Which water utility serves DECATUR?

DECATUR is served by DEKALB COUNTY. DEKALB COUNTY serves approximately 743,000 residents.

Tap Water Quality Report

Tap water quality in DECATUR, Georgia

Q: Is the tap water in DECATUR, Georgia safe to drink?

DECATUR's tap water receives a grade of B (81/100) from TapWaterSafety.org. The most significant water quality concerns are: Total trihalomethanes (TTHMs) significantly above health guideline, Haloacetic acids (HAA9) significantly above health guideline, Haloacetic acids (HAA5) significantly above health guideline. Grades are based on EPA SDWIS, EPA ECHO, EWG Tap Water Database, and the utility's published Consumer Confidence Report.

Served by DEKALB COUNTY. 743,000 residents.

Average score 81/100

Utilities 1

Population 743,000

81/100

Good

ⓘ How did we get this rating?

Quick answer

Tap water in DECATUR, Georgia receives a grade of B (81/100) from TapWaterSafety.org. It's served by DEKALB COUNTY. The most significant water quality concerns are: Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.

Data sources for this grade: utilities.csv EWG Tap Water Database ⓘ How did we get this rating?

What's in DECATUR's tap water

Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving DECATUR.

Total trihalomethanes (TTHMs) significantly above health guideline

Moderate concern

Total trihalomethanes (TTHMs) detected at 31.2 ppb, 208x above the EWG health guideline of 0.15 ppb.

Haloacetic acids (HAA9) significantly above health guideline

Moderate concern

Haloacetic acids (HAA9) detected at 10.2 ppb, 169x above the EWG health guideline of 0.06 ppb.

Haloacetic acids (HAA5) significantly above health guideline

Moderate concern

Haloacetic acids (HAA5) detected at 10.4 ppb, 104x above the EWG health guideline of 0.1 ppb.

EPA compliance record

Official U.S. EPA records for DEKALB COUNTY (system ID GA0890001) for the last 3 years. Checked 2026-10-07.

No EPA violations in the last 3 years.

0 of 12quarters with a violation

Nolead above EPA action level

11/14/2023last state inspection

Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.

Recommended filters for DECATUR

Filters matched to the specific contaminants in DECATUR's water supply.

Carbon filter certified for VOCs (NSF/ANSI 53)

$180-$599

Activated carbon is effective for disinfection byproducts like TTHM. Look for NSF/ANSI 53 VOC or chloroform reduction.

Aquasana AQ-5300 Under-Sink Filter

$180-$240 NSF 42, 53, 401, 372

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AquaTru Countertop Reverse Osmosis

$449-$599 NSF 42, 53, 58, 401, 372

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Aquasana OptimH2O Reverse Osmosis + Claryum

$429-$549 NSF 42, 53, 58, 401

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Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.

All contaminants detected in DECATUR's tap water

Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →

Contaminant	Detected	EWG US health-based	EPA US legal	EU DWD Europe	WHO global	CA PHG strictest US	Tested sample year	Status
Total trihalomethanes (TTHMs) Disinfection byproduct	31.2 ppb	0.15	80.0	100	—	—	—	208× over
Haloacetic acids (HAA9) Disinfection byproduct	10.2 ppb	0.06	—	—	—	—	—	169× over
Haloacetic acids (HAA5) Disinfection byproduct	10.4 ppb	0.1	60.0	60	—	—	—	104× over
Bromodichloromethane Disinfection byproduct	4.59 ppb	0.06	—	—	—	—	—	76× over
Chloroform Disinfection byproduct	23.6 ppb	0.4	—	—	—	—	—	59× over
Trichloroacetic acid Disinfection byproduct	3.76 ppb	0.1	—	—	—	—	—	38× over
Dichloroacetic acid Disinfection byproduct	6.64 ppb	0.2	—	—	—	—	—	33× over
Dibromochloromethane Disinfection byproduct	2.6 ppb	0.1	—	—	—	—	—	26× over
Nitrate and nitrite Inorganic	0.535 ppm	0.14	10.0	11.3	11.3	10	—	3.8× over
Chromium (hexavalent) Heavy metal	0.042 ppb	0.02	—	—	—	—	—	2.1× over
Chlorate Disinfection byproduct	26.1 ppb	210.0	—	—	—	—	—	Below guideline
Manganese Heavy metal	6.4 ppb	100.0	—	50	80	—	—	Below guideline
Strontium Radiological	0.0299 ppb	1500.0	—	—	—	—	—	Below guideline
Fluoride Inorganic	0.55 ppm	—	4.0	1.5	1.5	—	—	Below guideline

All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.

Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.