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Tap water quality report

Manalapan Twp - Knob Hill

EPA monitoring tested this supplier for 80 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
21
detected
8,700
people served
0
health-based violations
New Jersey rankingsLead in New JerseyPFAS in New Jersey
Water source
SWP
Ownership
Local government
Counties served
Monmouth

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
10
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Archived 2024-07-01 → 2024-09-30
MR Monitoring Archived 2024-07-01 → 2024-09-30
Other Monitoring Resolved 2011-07-01
Other Monitoring Resolved 2011-07-01
MR Monitoring Resolved 2006-04-01 → 2006-04-30
MR Monitoring Resolved 2006-04-01 → 2006-04-30
MR Monitoring Resolved 1996-01-01 → 1996-12-31
MR Monitoring Resolved 1996-01-01 → 1996-12-31
MR Monitoring Resolved 1996-01-01 → 1996-12-31
MR Monitoring Resolved 1996-01-01 → 1996-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0085 µg/L 3/6 2024
PFOA 0.0078 µg/L 3/6 2024
Pfpea 0.0059 µg/L 2/6 2024
Pfba 0.0076 µg/L 1/6 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
22.85 µg/L
No EPA limit set
worst single sample: 28.55 µg/L
63/63 SYR4 2012–2019
Chloroform
43.06 µg/L
No EPA limit set
worst single sample: 51.9 µg/L
63/63 SYR4 2012–2019
Dibromochloromethane
13.29 µg/L
No EPA limit set
worst single sample: 17.94 µg/L
63/63 SYR4 2012–2019
TTHM
76 µg/L 95%
of the EPA limit 80 µg/L
worst single sample: 98.5 µg/L
63/63 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
45.18 µg/L 75%
of the EPA limit 60 µg/L
worst single sample: 61.4 µg/L
63/63 SYR4 2012–2019
Dichloroacetic Acid
19.79 µg/L
No EPA limit set
worst single sample: 22.6 µg/L
62/63 SYR4 2012–2019
Trichloroacetic Acid
14.175 µg/L
No EPA limit set
worst single sample: 20.8 µg/L
60/63 SYR4 2012–2019
Dibromoacetic Acid
6.465 µg/L
No EPA limit set
worst single sample: 9.17 µg/L
56/63 SYR4 2012–2019
Bromoform
1.765 µg/L
No EPA limit set
worst single sample: 2.24 µg/L
51/63 SYR4 2012–2019
Copper
200 µg/L 15%
of the EPA limit 1300 µg/L
worst single sample: 260 µg/L
45/65 SYR4 2012–2019
Monochloroacetic Acid
19.875 µg/L
No EPA limit set
worst single sample: 22.6 µg/L
42/63 SYR4 2012–2019
Monobromoacetic Acid
7.656 µg/L
No EPA limit set
worst single sample: 20.2 µg/L
32/63 SYR4 2012–2019
Lead
0.0026 mg/L 18%
of the EPA limit 0.0150 mg/L
 23/23 LCR 2025
Lead
5.4 µg/L 36%
of the EPA limit 15 µg/L
worst single sample: 6 µg/L
4/61 SYR4 2013–2019
Barium
193.5 µg/L 9.7%
of the EPA limit 2000 µg/L
worst single sample: 200 µg/L
2/3 SYR4 2012–2018
Combined Radium (-226 And -228)
1.444 pCi/L 29%
of the EPA limit 5 pCi/L
worst single sample: 1.5 pCi/L
2/2 SYR4 2012–2018
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/4 SYR4 2012–2018
59 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylene DibromideEthylbenzeneHfpo-DaMercuryNetfosaaNfdhaNmefosaaNitratePFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DE SHAW, JOHN
Phone
732-446-5102

Frequently asked questions about Manalapan Twp - Knob Hill

Is Manalapan Twp - Knob Hill tap water safe to drink?

EPA monitoring detected 21 contaminants in Manalapan Twp - Knob Hill's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Manalapan Twp - Knob Hill's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Manalapan Twp - Knob Hill serve?

Manalapan Twp - Knob Hill reports serving 8,700 people in New Jersey, per its EPA record.

Has Manalapan Twp - Knob Hill had any water quality violations?

The EPA has 10 violations on file for Manalapan Twp - Knob Hill, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.