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Tap water quality report

Loudoun Water - Central

EPA monitoring tested this supplier for 113 contaminants and detected 23. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

113
contaminants tested
23
detected
334,808
people served
7
health-based violations
Virginia rankingsLead in VirginiaPFAS in Virginia
Water source
Surface water
Ownership
Local government
Counties served
Loudoun

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.

7
health-based violations
39
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1993-12-01 → 1993-12-31
MCL Health-based Archived 1993-12-01 → 1993-12-31
MCL Health-based Archived 1993-12-01 → 1993-12-31
MCL Health-based Archived 1993-12-01 → 1993-12-31
MCL Health-based Archived 1993-02-01 → 1993-02-28
MCL Health-based Archived 1993-02-01 → 1993-02-28
MCL Health-based Archived 1993-02-01 → 1993-02-28
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0034 µg/L 1/8 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
Copper
277.6 µg/L 21%
of the EPA limit 1300 µg/L
worst single sample: 522 µg/L
357/361 SYR4 2014–2019
TTHM
63.765 µg/L 80%
of the EPA limit 80 µg/L
worst single sample: 102 µg/L
290/290 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
54.6 µg/L 91%
of the EPA limit 60 µg/L
worst single sample: 93.8 µg/L
290/290 SYR4 2012–2019
Bromodichloromethane
10.605 µg/L
No EPA limit set
worst single sample: 13.9 µg/L
280/280 SYR4 2012–2019
Chloroform
55.03 µg/L
No EPA limit set
worst single sample: 92.1 µg/L
280/280 SYR4 2012–2019
Dichloroacetic Acid
27.42 µg/L
No EPA limit set
worst single sample: 43.3 µg/L
280/280 SYR4 2012–2019
Dibromochloromethane
5.365 µg/L
No EPA limit set
worst single sample: 10.7 µg/L
276/280 SYR4 2012–2019
Trichloroacetic Acid
25.765 µg/L
No EPA limit set
worst single sample: 46.2 µg/L
268/280 SYR4 2012–2019
Dibromoacetic Acid
2.366 µg/L
No EPA limit set
worst single sample: 3.33 µg/L
117/280 SYR4 2012–2019
Bromoform
1.2725 µg/L
No EPA limit set
worst single sample: 2.27 µg/L
96/280 SYR4 2012–2019
Monochloroacetic Acid
4.265 µg/L
No EPA limit set
worst single sample: 5.42 µg/L
43/280 SYR4 2012–2019
Lead
0.00050 mg/L 3.3%
of the EPA limit 0.0150 mg/L
 22/22 LCR 2026
Lead
10.775 µg/L 72%
of the EPA limit 15 µg/L
worst single sample: 20 µg/L
16/361 SYR4 2014–2019
Fluoride
700 µg/L 18%
of the EPA limit 4000 µg/L
 12/12 SYR4 2014–2019
Nitrate-Nitrite
1787.5 µg/L 18%
of the EPA limit 10000 µg/L
worst single sample: 1900 µg/L
10/11 SYR4 2014–2019
Barium
39.95 µg/L 2%
of the EPA limit 2000 µg/L
worst single sample: 41 µg/L
8/8 SYR4 2014–2019
Gross Beta Particle Activity
5.0025 pCi/L
No EPA limit set
worst single sample: 5.4 pCi/L
4/9 SYR4 2014–2019
Combined Radium (-226 And -228)
1.0554 pCi/L 21%
of the EPA limit 5 pCi/L
worst single sample: 1.08 pCi/L
3/8 SYR4 2014–2019
Atrazine
0.3375 µg/L 11%
of the EPA limit 3 µg/L
worst single sample: 0.3500 µg/L
2/10 SYR4 2014–2019
Nitrate
450 µg/L 4.5%
of the EPA limit 10000 µg/L
 2/4 SYR4 2014–2016
Gross Alpha, Excl. Radon And U
3.7 pCi/L 25%
of the EPA limit 15 pCi/L
 1/7 SYR4 2014–2019
Simazine
0.0800 µg/L 2%
of the EPA limit 4 µg/L
 1/10 SYR4 2014–2019
90 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromateChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
COGSWELL, CATHERINE
Phone
571-291-7844
Email
[email protected]

Frequently asked questions about Loudoun Water - Central

Is Loudoun Water - Central tap water safe to drink?

EPA monitoring detected 23 contaminants in Loudoun Water - Central'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 Loudoun Water - Central's water?

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

How many people does Loudoun Water - Central serve?

Loudoun Water - Central reports serving 334,808 people in Virginia, per its EPA record.

Has Loudoun Water - Central had any water quality violations?

The EPA has 39 violations on file for Loudoun Water - Central, of which 7 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.